After having orgasm by squirting, using water based lubricant and my bf did not ejaculate, there was oral sex, fingers, fingers were used both spots down there and careful not to put fingers in opposite places. There were several orgasms throughout the day. Next day I have a burnt like rubber smell what would cause this. My bf thinks I went out while he was asleep and was with someone else. I am and gave been completely faithful. What would cause such a foul of it?