When I put my middle finger in my girlfriend vagina can feel some type of gland inside of it I searched several times (internet) but I can't find on what is that is that ok to sex with her because I don't know what is that I don't want to hurt her. I know the length of vagina is 7 inch but I feel something there with only my middle finger is that virgin sign? I don't know help me. Because we want to sex.