'Can I introduce my penis into your vagina?' (Be explicit about what goes where.)
'May I make an initial pelvic thrust?'
'I did not feel that consent was explicit enough there. Let me pose the question again. May I make an initial pelvic thrust to push my...'
'Yeah, I know what you meant. Go ahead.'
'There. Can I make another? '
'That'd be two in total so far.'
'Yeah, look, just do it, right?'
'I have to say at this juncture that I have concerns about your tone. Of voice, I mean. Is it OK if I...'
'Dude, is this a fuck or a Q and A? Just fuckin do it, already.'
'You wanna watch a movie instead?'
Even if every sexual encounter proceeded in this stultifying manner, in the event of an accusation of assault, how would anyone demonstrate that consent had or had not been given? Nobody could, as anyone can lie. We are no further forward, then. Next step I suppose will be to make it mandatory to video all sexual encounters, and the chillingly-named Panopto software, now found in most lecture theatres, could be installed in all student bedrooms. Meanwhile go here, where Jeff E. Brooks-Harris & Christine A. Quemue of the University of Hawaii have prepared a seminar on how not to rape someone. Not only is consent fun, you can make a few bob out of promoting it.