And there you just confessed your problem. You let homosexuals dominate any rainbow artwork. That’s damned wimpy. It’s time to recapture the territory.
I’d begin possibly by suggesting a “straight” symbol (which can apply equally to marrieds or virtuous singles). A target painted with its rings in rainbow colors, and an arrow in its bulls-eye.
Do we really need symbols? Their use of the rainbow or whatever they want to use just lets me know who to avoid.