I have never even heard of anyone I know trying tantric sex. I think it's a load of pish personally, but that's just me.
See that's where communication comes in handy, like if someone is treating my vagina like they have a pneumatic jackhammer for a penis, I'm going to tell them!
And I have one friend who never came before, but just the once
Edit: I should've quoted you, that looks all over the place. Old habits die hard.