Aubergine - I just had to come out of my negative lurking in solidarity about having a partner who gets 'stage fright'.
It's an absolute pain in the backside, but I've found the ONLY think that helps at all is to act completely and utterly blasé about the whole thing.
When the pressure's off, he's better. I DO tell him roughly when the fertile window is, largely so that he can avoid wanking (sorry TMI). That helps.
Also, he's much less successful when he's had a drink and about 10 times more successful when hungover. So I can work around that a bit!
The awful thing is that I spend a lot of time manipulating the situ so that the "emotions and complicated feelings" are not a problem. But needs must!!!
It's funny, I didn't think many others had this problem as you see lots of people saying they're at it every day while they're fertile. I just think - HOW? My DH would be happy to do it every day, but god knows what the strike rate would be like 