the odds of an unintentional pregnancy would be very very low.
how long could sperm survive on a hand that has been wiped off but not washed? . if semen ended up on a hand that was then wiped on clothes/sheets (and no longer appeared or felt wet) and then a few minutes later that hand was inserted into a vagina what are the odds that there would be any viable sperm left and there would be any risk of pregnancy?