Its uncleanness,
Lev 15:16 And if any man's seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even.
Lev 15:17 And every garment, and every skin, whereon is the seed of copulation, shall be washed with water, and be unclean until the even.
but having sex is unclean too;
Lev 15:18 The woman also with whom man shall lie with seed of copulation, they shall both bathe themselves in water, and be unclean until the even.
Lev 15:32 This is the law of him that has an issue, and of him whose semen goes from him and is defiled with it,
Lev 22:4 And he who touches any uncleanness of a person, or a man whose semen has gone out from him,
I cant give any advice though sorry