Zagadai: Strange. I didn't see anything in the original post about being "sexy" and "hot" (Only the post-name had sexy as a part). I did see concerns about getting pregnant, and so elaborated on that topic. I think you have the off-topic position there, dude.
But it must be said that the anus is not a route to pregnancy. And sperm do not swim on skin--they need to be inside--way inside--to have any chance. Further, that unless there are sperm on the penis or coming out of it, then it does not matter where the penis is--even in the vagina.
My own long married experience has been that no amount of semen on the outside of the body ever leads to pregnancy. Additionally, as long as there is no ejaculation, there is no pregnancy. That is my 20 year married life experience--with a LOT of sex (more than you singe horny losers, LOL!).
But allowing a man to go inside unprotected is a bad idea unless (a) you are in love, (b) he respects you utterly, (c) he knows his body and the dynamics of his ejaculation, (d) you trust him, and (e) you are sure he knows his body and (f) he is willing to get out of there before he goes off. Otherwise, use protection.
If he has been in other women, then put a sheath on him. He is dangerous. Unless he actually marries you--then you can go natural. This advice is coming from a man.