masterbation

i dont think it will ever hurt anything unless you start to get red and raw from to much play, just wate a wile and you should be good. i have done that to a girl about 6 times in one day and she was fine.

You can masterbait all you want as long as you take care not to hurt things like rubbing till they are raw or using toys that hurt always use plenty of lube your own or store baught to prevent rawness and it will also let you get off a little better ie. the sensation of the lube fron yourself or bottle will make you slippery good luck and have fun
Ps your own lube is just a finger away slide in youe vagina and it will be nice and juicy

Ya I don't see a problem with that.
My girlfriend (19 years old) does it 3 or 4 times when she does, and she masturbates about 3 times a week.
The only issue she's had is that sometimes she overdoes it (5 times in one day) and her clit gets dry, but that resolves itself after a few days and some lotion.
My point being, if you're not doing anything over the top, you should be fine