Yet another euphemism
for sexual intercourse
This one adds an element of pseudo-shame to the mix...seems that we must consider one of the most intimate forms of communication nasty because our genitalia are unattractive.
I happen to think my wedding tackle is rather fetching, and as for the female complement to my man-dandies...well, let me simply say that I spend plenty of time seeking out photographic representations of the aforementioned erogenous zones...no small portion thereof whilst at work! I've said too much.
If you've got what you think are malformed, unpleasant, or downright hideous naughty bits, make sure that your assessment is accurate before trundling off to a plastic surgeon for an estimate. I recommend displaying your package proudly to anonymous passers-by in the street and collecting their reactions.
"Public lewdness" my ass.