Three on Getting to the Bottom of Things

So my boyfriend of 9 months was asking me about anal sex. We only ever done oral sex, so when he brought up anal I was a little scared. We both decided to at least see if it could work. We were at his house and I got on my knees and he slowly went in. At first if hurt then it didn't. All in all we only did this for about 7 seconds then we stopped....