A man is programmed to seduce a woman into letting down barriers. It starts by getting his hands on her breasts, his hand up her skirt and then full sex. But the urge to "persuade" her to surrender more and more of herself continues, anal, fellatio and so on. It is a need in men to dominate and control by getting their partner to "submit" ever more. The more she allows, the more he feels empowered. Anal sex is "wrong" therefore more exciting, and if he can persuade you to indulge he has added another notch to his gun. If you watch porn at all, it is all about men dominating women, deep throating, anal, gang bangs, double penetration, fisting, ever more extreme and violent degrading of the fair sex. If you don't want it say "NO", my wife did to me and that was the end of the matter. If he has any real feelings for you he will respect your wishes, if he doesn't he will probably try his luck elsewhere, and if does that your well rid.