I recall the song Mac the Knife.
“Fancy gloves has old Mac babe
So there’s never a trace of red..”
You might be right and a i wonder of the same can be said of black condoms? Only one gal i knew used them.
However you have already paid, got started with stuff and may even had oral sex on her
Especially bad if she is on a concealed period. What do you do when you see a red or black condom? Greed overcomes moralistic behaviour and not offer sex to men on that day.