Re: Questions about a new boyfriend...
There sure is some pressure on a guy when he is about 'to perform', so it's normal that he can lose his erection. This can even happen at the 20th time. Another reason can also be that he's stressed out or that he's got other things in mind such as 'Did I pay all my bills'...that can also make him lose his erection...or that you made a comment about him...so that he doesn't feel confident anymore...it's just the same as with gurls(when a gurl is always asking herself during the acct if she tourned out the light at home...it's not gonna work out)...
Concerning the fact the he does get an erection but that it doesn't stay hard, it can be because he's not turned on by the position you two r doing or the action u r performing on him (this can have avarious reasons though, see above)
There might also be a possibility that he doesn't like condoms, I do think however that condoms/birth control contribute to a safer and happier sex life, so maybe you could 'involve' the condoms in your foreplay? You could try putting it on his penis or maybe even try to put it on with your mouth (tricky one but it works...watch out with the teeth)
The best thing you can do when he doesn't get an erection is to stay calm, arouse him, maybe perform some oral/hand sex on him so that he regains his erection. Show your comprehensive side (don't make him feel like a total loser) cuz after all it's all in his head...
I'm sure it'll work out fine.