If you're talking about times a day I've sat down and masturbated... five or six. If you're talking about orgasms... 23 or so.
Absolutely, no shame at all! If you can do it 18 times, sheer awesomeness. *jealous* I think within 24 hours my top was 5 or 6. I don't think it was more than 4 in one waking period though.
7 times... long ago aswell.. and it wasn't so much as in a day as much as in 24 hours.... damn waking up at 4:00 AM with the sudden urge!
*gasps* I've masturbated and came about 12 times. Starts to hurt by the end of the day. So far for the guys I think i'm on top. Keep in mind i had locked myself in my room for days with no contact with the outside world