Over the past month I have gone down on my boyfriend around 5 times and each time I get severe stomach cramping and stomach issues afterwards. He is the first guy I have ever done this with so I'm hoping that I am having this reaction just because of the taste and its mainly psychological. From what I've read semen doesn't have anything unusual or potentially dangerous in it. Did anyone have this problem when they first started swallowing? I've talked to my boyfriend about this and he said that of course I dont have to swallow or even finish with my mouth but if possible I would like to because I like being able to do this for him.