She might be a little bit nervous, so she might be tensing up, making it harder for you to penetrate her. Ask her of she's okay, try to make her a little bit more relaxed and
…comfortable. You might also wanna try to spend a little more time on the foreplay. If she's not turned on enough, she might not produce enough fluid to lubricate (and thus prepare her vagina for sex) her vagina. make sure she's nice and relaxed, and turned on enough. But do ask yourself this question, if she is in fact tensing up and nervous, she might not be ready to have sex. so take it easy, and make sure she's completely ready for it. good luck! and be safe ( Full Answer )