Hello. After Sex I Wear Only Black Boxeshorter. I Mean

Hello. After sex i wear only black boxeshorter. I mean underwear. And everytime in morning i have like dry sperma in pee hole . But this is like dark skin and i must make out with hands or wash. Im very worry . Is this normal and come from black underwear. Maybe little sperma stay inside and go out from the hole with time . This is like glue. Im worry . I want to know if is any problem . Pls answer?