it depends on a lot of things my man.. I will give you a few options!!!. . If she is nervous and she can not relax and enjoy, it is hard to come. Also, if she has a 'new' partner (=you) sex is new and very different compare other boyfriends she had before. You have to get used to each others body. It takes time!. . For-play is very important. give her a nice massage with lotion or oil and avoid her 'particulars'. Just touch her bum, and don't go any further for a while. You can tell wether she wants more and she will get excited and very horny and wet without even touching her 'there' When you finaly touch her she will be so horny by the teasing that coming will be a lot easier...good luck and have fun