how to prevent boyfriend from having sex?

I am fine while having sex most of the time but sometimes I start thinking about not performing well or going limp and I go limp and its extremely hard to get back up because I'm so down on myself.. What can I do to prevent that..?

My ex and I broke up when I was 8 weeks pregnant. He has not been around during the time of me being pregnant. We get the chance to text once a mounth when he feels like it ( because when I try he is to busy and wants to be left alone) all he can do it talk crap to me. I don't want my child to have...

Hey I'm really very sad nowadays because my boyfriend wants to breakup with me. The reason was that I doubted him but it came out that he is faithful to me. Now he says what's the use of dragging out a relationship which has no trust. But now I seriously trust him a lot. I promised him that I...