Conceiving issues

So here's my issue. My husband and I have been trying to get pregnant for three years. I track my cycle every month I take the ovulation sticks, had clomid, still nothing but haven't given up hope. So this month like no other I track my ovulation and yesterday I got a positive for my levels (the happy smiley face flashing). So we start at it, and right when I think my husband will go, he gets all gun shy and can't complete the action. This has happen a few times now. Which is really frustrating because I feel like we miss that opportunity of the 36 hour window. Has anyone else experienced this and if so what steps did you take to rectify the situation. I'm to the point where I feel the need to wear an outfit or something because I don't feel like I am making him excited enough for me. Or is there any sort of vitamins that someone could suggest I can help in that area for him; if anyone has any advice I'd really appreciate it!