You can suck like that forever and he won't cum. Perhaps he wants to try it and wondered if it's any good. Trust and care are taken. My second husband however did not care for it. MANY women enjoy receptive anal sex. This gift is viewed as something given out of love , regard and a desire to give him something special and rare.
Same reason people like any other kind of sex: because it's fun. I am a huge fan of anal sex. Not necessarily giving, though I have girlfriends who enjoy receiving. Why do men fantasize obsessively about anal sex? Back Door Psychology. A lot of straight men like to receive anal stimulation and penetration. Many women ask themselves and their friends, "Why do guys like anal sex?" Turns out this kinky practice is only getting more popular. Here's what it really means when.