With me, I can go as far as cuddling, heavy petting and all that... but when it comes to "Tab A into slot B".... nah. It's not impotence or anything, I just don't get turned on. I don't know why. Meh... it's never really been a problem for me relationship-wise unless the person I'm romantic with is seeking sex and nothing but, or wants kids. Considering the amount of serious relationships I've been in can be counted on one hand, and on NO hands the amount that lasted more than a year or so... a lot of people seem to want sex and kids...
When I love, though... I love hard. Though not 'hard' in ways that some would prefer...
Asexual. Evidently the least loved of the sexual orientations.