thats bloody halirous.... i think your alone when it comes to making high reving sounds during sex.. lol.
the way i got my girlfriend to not be so annoyed about me playing with "toys" is to give her a go... it funny, seeing her scared to hit the throttle and then afraid of running over a rock, but she got the hang of it after a while, and soon saw why i enjoy it.
but she still thinks its immature or something, but she doesn;t bother me about it as much anymore