Hmm Skin, ok that works.

i would have assumed mine was my nipples (weird for a guy?), but it turns out to be my neck. that'll work, too!

apart from the obious, nipples (yes as a man we are sensative to the nipples too) and armpits

mine's my skin....i've always been fond of being kissed and licked on the back of my neck and light tickling up and down my back...but my skin in general is really sensitive and i keep it very moisturized so my b/f always wants to touch it! hehe

Another neck person here......I already knew that. Pulling up my hair and kissing the back of my neck....ohhhhhh myyyyyy, I'll follow you anywhere.