I'm not getting at Richard here, just using his example!

It seems there may be double standards at work within the male perception.

Oh, all you blokes - think back to when you were say from 12 to 17. You'd have given your right arm to have a pretty female schoolteacher jump your bones. Too many po-faced gits have formulated our laws.

If a boy has sex with a (female) teacher he's a 'lucky sod', and the teacher was generous with her affections.
If a girl has sex with a (male) teacher then she is automatically assumed to have been corrupted & the teacher is a 'dirty old man'

Recently Jeremy Vine (Radio 2) did his lunchtime discussion/phone in on the subject of why there are so few men employed as nursery teachers, or even as primary school teachers. The general mood seemed to be that women who cared for children had the maternal instinct, while men who cared for children had questionable motives.