Unprotected sex?: Some men have semen which is much more acid than others and acidity could cause a burning sensation. Suggest, as you have multiple partners, that you insist on his wearing a condom to lessen the risk of your getting an std. Could also be related to lubricated your vagina becomes before penile insertion, ie how turned on you are". Sex is rougher with some partners than with others.
Answered 4/22/2013
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