Does touching semen necessitate ghusl? Is it permissible to pray in a dry, impure garment? Does the ruling of impurity transfer from a wet or dry impure substance to a dry pure substance merely by contact?

The mere contact of semen with a person's body does not necessitate ghusl (ritual bath); rather, ghusl becomes obligatory upon its emission with desire. A garment that has been soiled with impurity and then dries is not permissible for prayer before it is purified, nor does it become pure simply by drying. If a dry pure object comes into contact with a dry impure object, it does not become impure. However, if it comes into contact with a wet impure object, there is further detail.