I dunno about other guys, but most of the sensitivity on my penis is around the head and the ridge on the undercarriage. I admit that I would prefer full penetration, but it doesn't make intercourse devastating if the girl is just unable to accomodate. Honestly, in my personal opinion, I derive more pleasure just knowing that I'm pleasuring my partner. If she's a new partner, I always start off slow until I know her (or my) limitations. But hey, different strokes for different folks, right?