Foxy.... Baby...
Small penis = won't stick out past the g-suit/bunny suit/immersion suit/etc for an in-flight pee.
Large penis = same problem, won't bend enough to get past 3 zips.
Real men pee in their immersion suit.... Us "chopper" chaps wore them more often than you think - lots of transits over to the (in)continent. A quick rinse with a couple of bottles of Grolsch and they smelled good again...