My GI doctor told me once that if you really wanted to torture someone you would stab them in the butthole because there are so many nerve endings there. I have had my fair share of anal sex and the one time I let the guy get too rough (felt good during, not so much for the following couple of days) it was horrible! I haven’t read your post about the second time (yet) but I will say that the good side to all those nerve endings is that if you do it right it can be a LOT of fun. Even if you don’t want to do penetration with a penis, butt plugs can make for some really great DP sensation!