 [ Symptoms ] i have been having terrible heart palpitations ended up in the er please help me [ Disease ] hi perhaps you are allergic to something associated with sex e g condoms lubrication gels vaginal juices perfumes etc or possibly something you consume before sex keep a journal of everything associated with sex and the hives and perhaps you will find the culprit try using latex free condoms that could really be a big part of your penis problem as for hives that could just be down to you as this is totally natural in desmond morris is book the naked ape meaning us he has a whole chapter on the sex hives or rash that some people get across their chest shoulders belly or back hope this helps you good luck