my boyfriend loses his erection JUST before sex?!

yeah so, he loses his erection just before sex .. he can easily get an erection no problem, it even just happens sometimes when we're only kissing or something harmless .. he can ejaculate fine also because this happens fine during foreplay & oral etc .. we're both 19 and have been friends for about 7 years and have been together for a while also .. so he hasn't got any reason to be nervous, i suppose? is it perhaps performance anxiety?! could it be the condom? could he be allergic to latex? or is the condom maybe too small? once the condom goes on its just all down hill from there .. i know this really gets to him because he goes really quiet after it happens and gets really embarrassed, which is understandable really .. but he knows it doesn't bother me, and i still love him which he knows .. at first i thought it was me but i know he finds me attractive and that he loves me & that he really wants to but it just doesn't happen after that condom goes on and just before we are about to have sex .. thats it, goodbye erection! so, has anyone ever experienced this personally or has their partner? what did you/they do? should we see the doctor? and is there anything we should try before we go as extreme as visiting the doc? i'd really appreciate any info/advice .. thanks guys xx

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