I never come during sex, and it's been like this with every partner i've had, so i think the issue is mine. I don't care though. I don't know if it's cos i'm so used to it or what... but i just see being expected to come/or fake it, as a pressure, and it takes away from what's supposed to be an enjoyable experience.
For me to come during sex would be very difficult, and i'd really have to focus, and probably keep quite still and quiet, and then i feel bad cos it'd come across as if i wasn't enjoying it. I feel i should be writhing around and making appreciative noises, etc, or else it just seems dull and i worry that they're finding it boring.
So i just don't bother even trying to have an orgasm, cos it's so much pressure/hard work, and takes away from the enjoyment.
Try finding a guy who accepts this though... pff. They all get an attitude about it and don't like the fact i don't orgasm during sex.