Until SE makes male and female glamours equal...

[Synrin]

I myself have also given my (albeit female) character dark eyeshadow for example, but that's not so that she looks like she's wearing eye makeup but because it complemented the shape of her eyes to make them look a little less droopy with the female Au Ra face 1.
But with lipstick on male characters it's not something that somehow changes the face or eye shape slighty without really noticing it. It's really noticeable because it's extremely shiny. That's why I asked specifically about male characters with lipstick.

Would like to point out that Au Ra lip colours look like lip glosses while Elezen lip colours look like matte lipsticks (on females at least). So race might have to do with it!