My wife loves this dry humping part. Often times her slip is super wet as she is getting very aroused just by the grinding on his hardness. Her nipples are also very sensitive, so feel him even only lightly touching those also works its magic. I am very happy that she has done away with the bra - and now it seems that she might even go without nipple pad (she is pure Chinese, so this is a big thing considering her upbringing).
Even only listening to her nightout stories afterwards is a huge turn-on for me.