[foxpaws]

The only answer is you just don't -

If you say hello to every man woman and child that walks down the street - then, go ahead and say hi - but, 99.9% of people don't do that - so don't pretend this should be different.

If they are strangers to you - don't treat women differently than men - don't treat attractive women differently than plain women - don't treat old women differently than young ladies, they should all be treated exactly the same. If you don't cat call old men, then don't cat call young women.... if you don't say 'hi' to every man in a business suit - don't say 'hi' to a woman in yoga pants (even if you think they are 2 sizes too small, ah, which they weren't).

It is really pretty simple - don't treat anyone differently based on how they look, or whether or not you want to get into their pants.