After hearing about everyone's enjoyment of armpit tickling, I have my own erotic experience to share. I become VERY sexually aroused by tickling, especially her light touches (Knismesis, I believe is the term). Of course my male genitals are one definite area, but over the years my wife has found my armpits and underarms to be EXTREMELY sensitive to her expert attention. Like INSTANT viagra effects! She(we) discovered this one evening when we were watching TV in bed, but mostly 'making out'. I was 'moving too fast' so to keep me under control, she decided to have me stretch my arms up so she could kneel over them and keep them trapped between her knees on the bed. I was shirtless, so she played on my chest and nipples first, but then ran her fingers around and through my pits and along my underarms to the elbows. I went ballistic, not from laughter but arousal. She spent some time with her activity, and we had fantastic sex afterward. My wife doesn't get into tickling just for tickling, but ever since that discovery she will almost always add to my excitement by sensually tickling my armpits and underarms while I am making love to her in the missionary position. Supporting myself with my extended arms on the bed is essentially the same as being restrained, bec there is no way I am stopping the action no matter how much she does to me. But her armpit/underarm tickling brings my (our) sexual excitement (enjoyment) to another level!