missionary, definaetly. dont put her on top, unless shes not a virgin, but im guessing she is or you wouldnt be asking, just be gentle.... very very slow and gentle. that is easier said than done btw when it comes to sex as a dude, especialy first time hehe.
if your female you on top it allows the shaft of him to go in as far as you want and you can control as much as u want the thing is im not condoning underage sex in anyway i know i have and eerything and im not here to judge but just be carfull boys can hurt girls and ive even been hurt by a girl that just wanted to use me so she could get rid of her V's to move on to another guy
just make sure he/ she is the one you want and make sure that u trust them more then anything
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The first time I had sex we were in the missionary position, I suppose it's the first one you think of. I was on the bottom and I did try on the top during first time sex but it was so uncomfy for me. I only got used to being on the top once I'd gotten used to having sex, then most positions are great. A good thing about being on top for a girl is you can control how far in he goes etc but missionary was more comfortable for losing my virginity.