Any male who performs cunnilingus expects to be able to stick something besides his right index finger into the santum sanctorum. And every technical virgin knows that she must guard the holy of holies like a junkyard dog, so the last thing any good Catholic girl is going to do is drop trou and let her beau show her exactly what he can do with a bag of Pop Rocks and his big ideas. Sadly, all technical virgins live with one-sided sexual relationships, which is really an oxymoron. Sex is something two people have. And while oral sex tends to be something that one person performs, it is absolutely inexcusable to expect the same person to do it all the time.
Nobody truly loves performing fellatio.
Those who say they do are lying. And if she has to keep going back to the salt mines every time the guy buys dinner, she's going to stop feeling so peckish. Second, the male in this equation will begin to feel strangely detached. He may say that he's having his cake and eating it too, but a very palpable distance will grow between him and his partner, a kind of sexual inequality that will sow the seeds of resentment and ultimately end the relationship. Avoid the gray area.