i LOVE grinding with my friends. but grinding with friends and grinding with strangers has a completely different feel.
i should clear up that i'm not completely against juking. i've done it in the past and i'll do it in the future, no doubt. my friends at home don't rave, they club and bar hop. i just hate it when 1) guys don't ask, 2) they get too toucy feely, and 3) you're feeling at one with the music and and the world and life is perfect then BAM! suddenly there's a hard-on in your back.
there's definitely levels. but i think some guys should pay more attention to body language. example: i was dancing at monster massive COMPLETELY clothed (i'm talking long-ish dress, tutu, leggings, nothing really provocative) and suddenly i feel some guy moving his hands up my dress! i moved them but a second later they were right back! he got the message after i pushed him away again, but otherwise there would have been some problems.
good rule of thumb: if in doubt, there is no such thing as being too gentlemanly.
oh, and i totally have a list of crushes in my head, too! raving single is great, you never know who you'll meet.