I love my newfie gal. She's the absolute love of my life and she means the world to me. I will do anything to make sure she is happy and healthy while she's with me. But with that being said, I am under no delusions that canines, by default, are monogamous creatures by nature. They are usually not monogamous one bit. As I can see from her body language and overall demeanor, my newfie does like having sex with me the most because we are bonded with one another. However, she's not opposed to getting pleasure from another male as well. For canines sex is just... sex. It's something that is pleasurable to them as long as your respect their boundaries and wishes over the matter. Canines, unlike most humans, do not see sex as something sacred. It's nothing more than the release of happy brain chemicals that makes them feel good. This is true for humans as well, but society generally ingrains monogamy, sanctity, and sexual limitations within our heads.
But, with all that being said, I will not let my newfie sleep with just any random guy off of the street. I'm not 100% opposed to sharing her but there are a lot of tough stipulations that need to be met first. 1) I've known the other zoo for at least 3-4 years. 2) I am confident that they will disengage entirely if my newfie girl shows any signs of discomfort before or during sex, and that the person in question has demonstrated to me that they can indeed identify negative body language. 3) That the other zoo is STD free and doesn't regularly put themselves in a position where they can get an STD in the first place. To date, since she's been with me (nearly 2 years now), only two other people have gotten the privilege of sleeping with her.