spermicides

Sex hurts my girlfriend: how do I fix it?

Anonymous
asks:
I'm a 16 year-old male and me and my girlfriend have been going out for about 5 months. We have recently started having vaginal sex and were both a bit confused. We were both virgins so we have no prior knowledge of having sex. When we had intercourse she said that she was feeling pain when I put my penis in only an inch or so. We figured it was just since it was her 1st time....