Not one person has chimed in here with a possible, practical solution to this problem. Until me.
The first thing you have to realize about wolves, is that they're very big on imprinting. They will be loyal to what they know since the time of their birth. IT is what makes them the most unique social predator...very similar to lions in this respect. But this is where results drastically differ from cats.
Lions and bears, like wild life tends to do, have only one thing in common with wolves when mating season comes around. Fuck as much as possible, with as many as possible, as many times as possible before one or the other gives out during an entire heat cycle. In other words, as long as you're signaling you're available to mate, and the male is responsive to your advances in this way, you will most likely get lucky.
But...unlike lions and bears, wolves imprint upon their pack and those signals will always come first. To the point of fighting with another pack's literal ending in some cases, when competition is fierce. Make no mistake about it, wolves only trust who they have let imprint on their purpose for living. And if you show signs of disrespecting this in any way, a wolf will not look back, but rather move on but only in severely traumatic circumstances.
This is what drives wolves to have a prey drive in the first place. Mating goes beyond prey in a wolves need level. You take care of every other need before you even think about mating or having any sort of excitement. To a wolf, everything is an all or nothing experience with them. You may have the very best of intentions when feeding a wolf...say...a huge bowl of meet. But if one piece of meet is no good at the bottom of the bowl, and you try to take it from the wolf...and the wolf mistakes your body language for depriving it of satisfying a need, the wolf will get extremely aggressive, persistent and upset with you over this.
They view mating in the exact same way. When scientists were studying how to manually collect semen from a male wolf back in 1980's, the only way they could do this consciously, was to let the wolf have physical contact with the one pulling an ejaculate. And even then he would not get hard on command...it was a very unwilling process for the wolf, who was aware enough on what was going on who was likely coerced into giving a sample just to be left alone. For the rest of that wolf's life, that experience was so traumatic, that after every breeding season came and gone, even with a female around he could not get hard due to this. And this is why ever since then, all wild animals have been pulled using electroejaculation technique.
In other words, wolves take who is close to them very seriously. You have to be trusted, and spend a whole lot of time with them before they will open up to you about their most vulnerable position in life they'll likely ever be in because unlike any other species, they lock during sex and have to defend you and hope that you won't pull away, or cause painful trauma to their ability to reproduce and offer the ability for their next of kin to likewise take pack, family and life to the fullest possible extent.
Many wild animals rely on imprinting of more than just familiar beings close to them, but also their place in nature to feel as needed as possible. There's a lot more that goes into sex with wolves than you may realize. You can't expect this to happen overnight after meeting one in the wild...but you can, in time, encourage one to warm up to you as a life long protector, mate and lover when the mood calls for this. So long as you send signals that you are willing to work together as equals, you can achieve the impossible, literally.
So, how do you do it? Once a wolf is okay with you having physical contact with each other, and you have explored or even groomed one another...then and only then can you attempt to work in massages into the mix. Light, but firm pets or scritches that show your commitment to remain close and sleep closer to one another. This process may take several months if you're meeting a new wolf for the first time...and trust me, you will need to spend probably most of your day with one so they get comfortable knowing that when you're around, you're there to stay.
Wolves are very heavily planners and strategists. They worry bout everything. MAle and female wolves are the same beyond their sex organs. They fill whatever role they can, and respect the role that they have personally witnessed to benefit their needs before taking an active stance. Whatever you let one get away with, will likely amount to them wanting to keep such a position in mind. So a very firm hand is in order on this front if you wish to remain the alpha decision maker in your wolf pack.
Assuming you have all this squared away, and your close time spent together does not yield sudden movements of nervousness, aggression or surprise. I would slowly start moving towards massaging their genital area when you're ready to go all the way.
Remember, if this activity is accepted, not flagged by a wolf in need, you will get a signal very quickly informing you of their decision. And you have to react accordingly. Wolves foreplay is all the time. But actual mating will happen very rapidly. This is by natural design, in an attempt to not be disturbed in a den site while the pack guards the mating alpha pair as they give their lives for each other and make love.
Wolves literally are the reason why we know romance exists in the animal kingdom. So I can absolutely believe it when man's best friend is canine.
Above all, wolves value respect. Honor this commitment, and you may even be able to get a wolf interested in mounting you or vice versa out of peak breeding seasons. Just don't expect their sperm count to be higher, and expect them to thrust for a lot longer than dog if they're male. And take a lot longer to orgasm if they're female.
Wolves take their time when mating, but they rarely stop doing it until they release. You have to dedicate yourself to what the wolf is asking for. Because you aren't given long breaks before they come at you again literally like a perfect storm of firey passion and intensified interest.
Remember, when a wolf remembers how respectable you are treating their sex drive, or any other need, they have long term memories and expect the same commitment each and every time.
The moral of this long post is, never say never. This is a tried and true situation of, if you put the work in, and build it, they will come. Or cum in this case. A lot. All for you.
Please keep in mind, you are their entire focus and world to do everything with. So wolves that are lone wolves in the wild are the best possible chance you will get for having a one night stand, or getting to learn to trust you when their purpose in life is open and accepting of who you are as a whole.
Fun fact. Wolves only escape where they call home, when they don't feel appreciated and need to be mentally, emotionally and physically stimulated. Otherwise, they sleep as close to you as possible. And enjoy fun, play and life like everyone else.