You are not getting knotted, so while sex with a penis that has a bone inside can still be dangerous, getting tied is not an issue for most people. As long as you are talking about vaginal sex and not doing anal.
I thought the dog should be trained to know a girl. Now I met a guy with a dog wich is not trained who claims that it will be natural to the dog to knot a girl. what is the truth?
www.zoovilleforum.net
Knotting in humans almost never happens since the musculature needed for a tie to happen is not present in humans. So knotting is very unlikely, more likely the full knot will slip out at any point because there is nothing holding it in. So hold the knot, not the legs.
You are going to see the knot slipping out of a vagina in 99% of porn. The only possibility of knotting happens when there is a large size difference between the vagina and the knot or the rare vacuum lock mentioned in the thread above.
But the absolute most of people will not be able to hold a tie not even anally.