i've only done it twice. once 2 yrs ago.. and once about 2 wks ago. both times w/ my wife. dont know the difference between the 2 times, but after this time, she said 'we're gonna have to start doing that more often.' she loved..... and i cant say that i argued with her.
its a really different feeling and after relaxing enough to enjoy it, it's great.
as far as what the women get out of it.. you can buy a harness with either an inverted vibrator or a vibrating egg. inour case we had neither but the friction of the harness against her still have her an orgasm. very unexpected but o' so wonderful.
