The problem: You make the assumption that because you came, she came, too. Or you really don’t give much thought to it at all.
The fix: Rule of thumb: she comes first. Make sure that she is always pleased before you are. That way you can still have your happy ending knowing that she had her needs met as well. “Many men assume that just because they were satisfied, and she didn’t say anything afterwards, you had the green light to roll over and go to sleep,” Morse says. “If you’re not sure if she had an orgasm, she probably didn’t. And if you’ve never given any thought to her orgasm at all, you’ve got bigger problems.” Just because you asked her once or twice if she was satisfied and she says something like, “No worries, I’m fine,” or she mentioned she doesn’t orgasm every time, that doesn’t mean she wasn’t incredibly turned on by you and still wants an orgasm, even if she didn’t experience it through intercourse.
Make sure that even if you’ve already released, you muster up the strength to please her whether it’s with your fingers, mouth, or a sex toy. She’ll know that her satisfaction is important to you, and will feel more relaxed during intercourse knowing that if she doesn't climax before you do, she’ll still have fun with you afterwards.