Actually, what would be interesting would be for a man to go to the police to report "I woke up this morning to find my wife performing fellatio on me" and see what happens.

What would be even more interesting, and more likely to happen, would be for a man to go to the police to report "three years ago, before our marriage went sour, I woke up to find my wife performing fellatio on me". I've done enough family law to know that there are lots of ex-husbands bitter enough to do exactly that if they thought there was any chance at all of getting the ex-wife prosecuted. However, an ex-wife making such a complaint is going to be treated with scepticism; an ex-husband is simply going to be laughed out of the police station.