Well, considering dating takes at least 2 people (depending on how you live your life, and yes non-monagamy and polyamory are vaild), asking only one group is incredibly biased.
This handy chart is from the Aussie government. Other colours are possible, but have specific causes that most likely require medical attention. There are other things that were already mentioned in other comments that could cause weird colours.
I’ll take the hate on what I said. People saying they are going to push kids are in my experience more likely to cause harm then me wanting them to face consequences
And unless you have a degree realted to mental health, I don’t need your armchair diagnosis of misreading of my comment.
You know the easiest way to protect yourself from the pharmaceutical industry is to go silent. No electronics, no social media, don’t go to hospitals or police stations or anywhere there might be a first aid kit.
Then there is the way that isn’t around the bend, and realise you are just imagining things.