i've done it. i never thought it was right but thats sure how my first time was.
i've got mixed feelings about it i guess...if youre in it just for the sex then hell go for it cause you might not get the chance again if he's that hot.
then again...if you like him a lot and want him to respect you...dont put out that first time...now dont seem like the woman that talks to jr high kids about "worth the wait" you just need to earn some respect and build up some sexual frustration
thats always a plus...