I'm paranoid but need a answer to this question?

I was at my friends house,her sis and her fiance are known to have sex together. I was using her washroom,I could tell her fiance used the bathroom before me because the toilet seat was up. I was leaving the washroom and the doorknob was sticky (my friend assured me he washes his hands). Is there anyway that sperm... show more I was at my friends house,her sis and her fiance are known to have sex together. I was using her washroom,I could tell her fiance used the bathroom before me because the toilet seat was up. I was leaving the washroom and the doorknob was sticky (my friend assured me he washes his hands). Is there anyway that sperm can survive on surfaces like doorknobs? Can STDS be transferred through sperm? Can STD's survive outside the body for long?I'm sorry if I sound paranoid, I've heard alot of stories.
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