Sperm can survive on clothing for a few hours to several days, depending on the material and environment. Clothes made of synthetic materials like nylon or polyester are less likely to support sperm survival than clothes made from natural fibers such as cotton or linen. In addition, warm and moist environments will allow sperm to live longer on fabric than cool and dry ones. For example, if you leave your clothes in a damp bathroom with the door closed, it's more likely that any sperm present will last longer than if you hang them outside in cooler temperatures.