Dangerous Sexual Activites?

It sounds to me like it's something more immature than anything, as if they want everyone to know they are having sex. Obviously, there is no need for that type of behavior, no matter how good the sex is.

One thing I can share with you to consider is that human bites are very nasty and can cause infections.

Second, becoming addicted to that type behavior for sexual pleasure and arousal could cause problems for them down the line.

I am no expert by any means, so that's just my honest opinion.