a shower would be better followed by a change of underwear (boxers instead of briefs) and perhaps some talcum or corn starch in the groin to help absorb the sweating. rubbing alcohol is not harmful but it can be pretty cold. if he had any open wounds or rashes in his groin you would likely see him dance around a bit (it burns! ).
my husband frequently says that his testicles are sweaty. he wipes them down with rubbing alcohol is this ok?