You should try talking aboutthis with your partner before you guys do anythng together. My boyfriend had anxiety about sex before we got sexual, and during the first few months of our relationship. We know the true source of his anxiety, and so can do things to keep him calm. However, in the beginning he used to tremble all over when we did things as simple as kiss. The first time I blew him he cried. Can you imagine how I'd have freaked out, and the distress I'd have been in if I hadn't known in advance he might have a panic attack? I don't know if we could have recovered from that. But since I was prepared, I was able to bring him down, wipe his tears, and be a source of comfort and support.