If a boy masterbates and ejaculates on a cloth then he put that cloth on floor and go for doing his work then after 4 hours he sees that sperm gets totally dry and dry sperm stain are their on that cloth then he pick up that cloth from floor and put it on chair after sperm gets totally dry. After some time he remove his dry sperm cloth from chair for washing. So my question is that if a girl sit on same chair where dry sperm cloth is kept can she become pregnant by this act?? Dry sperm remains survive on clothes more than 4 hours from ejaculation??