yatzr

my gf and i recently experimented with me sticking a finger in her ass while i ate her out. She liked it a lot and then she wanted to do it to me. At first i said no cause i didn't feel comfortable with it, but then i felt bad because she'll do anything i ask. So i tried it by myself once while jackin off and it just made me feel like i had to take a crap...then my muscles just tightened up and made it almost hurt. I tried finding the prostate but couldn't. Needless to say, it was a bad experience, but i wanna give it a chance with my gf...so are there any tips on how i can make it a better experience for myself or maybe to help get used to it...and where is the prostate? thanks

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