My first time using it was with an SP. I too am young and have no use for it, but got a sample from a doctor friend. Erection was about normal, sensativity was down. It took a long time to get home. I agree with the head ache/hangover feeling. It is easier to get going for the second round, but the lack of feeling blocked my 2nd SOG. (Glove save?) I actually prefer not using it, but it was cool to try it once.
BL