Okay , I'm 18 now and I've been experiencing nausea and even literal Vomitting when i begin to get sexually aroused since i had gotten out of the hospital when i was 16 . It doesn't happen to me all the time , only seems to be with new partners. But if I had been with Them for a long time it's easier and I don't get the nauseous feeling . I've come to realize that it is a mental disorder , if you have been sexually molested or harrased It may make new encounters difficult and your mind is working subliminally and prevents you from having to go through such feelings again, or if you have second thoughts on your partner it may Effect your subconcious and you may get sick because you two are having problems whatever they may be, cheating, lying...whatever. With thst being said , this shows why you should always wait until you KNOW your partner to be sexually active with them. If you are getting nauseous with a new partner , your body is only telling you that youre not ready to do that with said person. & that youshould wait to be intimate . If its happening with your life long partner , wife, Husband ..you two may be experiencing trust issues or just general second thoughts about the person . I hope this helps someone and i also hope someone can help me and better explain how to prevent such feelings ..because i still get it . I am single and whenever i tried being sexually aroused i just throw up .. Maybe its simply my mind telling me that im emotionally not Ready for a new encounter .