I know this question is a little weird, but I really need to know. I googled it and could not find an answer. I am allergic to peanuts and my boyfriend gave up peanuts when we first started dating. Now Thanksgiving is coming and we will be apart for a week. He loved peanuts and used to eat them all the time. Does anyone know how long peanut protein is excreted in semen? If he wants to eat peanuts while we are apart, I really don`t mind, as long as he stops in time for me to be sure that there is no peanut protein in his semen when he gets back in town. I read that it is excreted in semen longer than it is excreted in saliva. Does anyone know the answer? Also, if we use a condom, which we are already doing, then does that mean I would not react if there were actually peanut protein in his semen? Thanks!