highly likely and dispose of your sperm-laden tissues properly in the toilet and flush them away. it would not be likely that any woman would decide on using a used wet tissue to wipe themselves after going to the toilet but dispose of them anyway. viable sperm quickly dies after being exposed to air and i know of no cases where a pregnancy was caused by a sperm-laden tissue.
question about sperm survival? . i'm a guy. how long does sperm last after being wiped by a tissue paper towel napkin or kleenex? can the sperm live for more than 2 minutes? can a highly determined person (man or woman) use that kleenex to get someone pregnant?