So last week I gave my boyfriend a hand job. He got semen on his hands and he briefly washed them. After that he may have put his hands in his mouth, and I know that sperm thrive warm wet environments which the mouth is. So I figured that the sperm on his hands could have transfered to his own mouth. He then drank alcohol and soft drinks and ate food. After, he gave me oral. Could any of the sperm in his mouth transferred to my vagina and cause pregnancy? Can sperm survive in the mouth even if there was any there? Do the enzymes kill them? Or can they survive due to the warm wet environment? I need peace of mind :(