Taking a condom off when consent was given for a condom is deemed sexual assault these days.
What bothers me about all this is that there are areas where morally / ethically something is wrong but where is the line into criminal? And we probably all do have different lines.
For eg I would say the police force / people in charge who decided that police officers should form relationships with those they were infiltraitng, to the point of long terms relationships and having children, and then just vanishing when the plug was pulled, leading in some cases for women and children to be searching for these "missing" men is so far wrong as to be criminal somewhere along the line.
However, I don't see lying about being married as being criminal, although it does obviously make you a total shit.
Mixed in with all this is the differential in the sexes, with practical biological reasons + social reasons often "pitting" men and women against each other in het situations, with women cast as the "gatekeepers" of sex, and men as the ones who should try any and all means to break down that gate (but supposing to stop at excessive physical force). With that dynamic in place, everything becomes complicated. Issues of consent between men and women are very complicated.
I think there would be ? around whether such entrenched behaviours vanish when a person decides they are the opposite sex... Do transmen display the levels of male sexual entitlement and feel as comfortable with really quite intense coercion as the average non criminal man? Do trans women lose it (cotton ceiling would suggest not).
All of this married / vasectomy stuff is a red herring.
The issue is, does a person have a right to know the sex of the person they are going to fuck / fucking/ in a relationship with?
The courts have said that women pretending to be men to get sex is bad and put them in prison.
Not seen a similar case with a man pretending to be a woman - I suspect that the more likely situation is with male partners (who seem bizarrely to really equate the trappings of femininity with female as anyone who watched big brother saw! - this is due to the level of objectiifcation) and then it's not the police that end up involved, if anyone is, it's A&E.
I am not sure where I stand on this TBH. It's an interesting topic to explore. Generally the police etc can't even manage to get to grips with the sort of rape that everyone accepts has no grey areas, as a crime, and so I don't hold out much hope for these sort of nuances.