Why would you want head for one second? If you have any kind of unprotected sex (vaginal, anal or oral, I didn't say frot or masturbation because they aren't sex), there's a change to get an STD.
I would even lick a penis that I thought was contaminated with STDs!
So I wouldn't do it. Although very unlikely for 1 second, but why the fuck would you want head for 1 second? lol