She has to come to that conclusion on her own. If you want to make your girlfriend want to have sex with you, the worst thing you can do is bring it up or try to force it when it's way too early. If you take too long and can only ejaculate via manual stimulation, do your best to get your partner to orgasm and then they can return you the favour. Ask her about her friendships, her childhood, and her favorite experiences. If your girlfriend says she's not ready to have sex with you, then you shouldn't pressure her. How To Have Sex Things you should never do while having sex How To Have Sex Things you should never do while having sex When you're in bed with your lover, the last thing you want to do is turn them off. In fact, trying to reason with her will only make her more frustrated, annoyed, and much less likely to sleep with you. If something's wrong, don't be afraid to ask her what's up. Putting your weight on your partner Even if you're a girl! Something as simple as "I'm going to let go," will suffice. This will turn your girlfriend off and will make her much less likely to sleep with you. If your girl is going to trust you enough to have sex with you, whether it's her first time or if she's had sex before, then she has to feel like she can depend on you. Running your hands on her body: Don't try making any arguments -- saying things like, "But we've been together for so long," "Everyone else is doing it," or "But I really, really like you," isn't going to make her feel any better. Instead, you should kiss your girlfriend for a few seconds, then hold back, stroke her, and talk to her.