Maybe he's scared?

Maybe it is easier for him to control the sensations himself..maybe he just needs to relax around you...

How old is he? How about his health? painful micturition，prostatic hyperplasia， prostatic hypertrophy，hypertension, cerebral embolism，apoplexy，erectile dysfunction, blood pressure, arrhythmia, chronic nephritis, renal failure, sexual hormone... May reasons would cause that.

hes prob scared he wont be good;.

Your B/F Has ED, Erectional-Dysfunction This is a problem that all men have from time to time in relationships,no matter what their age. I would say that there are three main causes for ED. The first one would be an early self-taught,come as quickly as you can ejaculation,or get that orgasmic high PDQ. That is well and good for a man without a female partner, but then she can, and does, change the sexual picture. His penis has been taught to come PDQ, And that's what it is going to do. But her body needs to be sexually fired-up,lots of Foreplay, and with his faded erection, Well, He won't have an erection to work with when she needs it most. Second Erectional Problem: Here we are talking about Anxiety, To be brief, The fear of Erectional-Failure, where he can't get his penis up or keep it up long enough to bring you to an orgasm. Keep in mind that when he engages in any prolonged Foreplay, His concentration is going to be on your lovely sexy body,not on his genitals. So then his penis will be semi-soft. And his penis will need your helping hand,vigorous stroking of his penis, will be needed to help him firm-up before his penis can come a calling, you need to also let him teach you how a man's penis needs to be manually stimulated,as he too needs to learn how to Masturbate a woman's vagins. The big mistake most women make when it comes to a man's penis is, "They Are Too Gentle with his penis,unlike a woman's genitals, a man's penis likes vigorous stroking to help maintain his erection. Me I'm 80,years young, and just as horny as a goat,but ED seems to curse us old folks more thanany other age. How do I handle this curse? Well, If your B/F will learn to use his upper penis, his tongue,it will never let either of you down,and it can do much, much more than a penis can ever do in pleasuring a woman's sexy body,and besides it can give a woman lots of wonderful orgasms one right after the other. But best of all You, a man, can know that sex is more than a penis,it's all of you. And ED won't really matter that much any more,and with this relieving of your sexual performance,who knows,Your penis just might have solved it's ED problem.

If he does in fact have ED he would be able to masturbate and not be able to have sexual intercourse. It takes substantially less rigidity in the penis for a man to bring himself to orgasm than to enter a relatively taught vagina. Try to get him to allow you to perform oral sex on him. As he begins to achieve orgasm note how ridge he is. If he is somewhat flaccid then you know the issue is a blood flow problem. If he can not seem to achive orgasm at all even with oral sex it is most likely another issue all together.