Not much I was actually looking at them recently and decided against it because the mileage and a mechanic told me they have transmission trouble like the Ford Explorer
Normally if you are flirting playfully and you get the feeling that they are also. Then you are most likely on the right track. Try brushing their hand or arm with yours, to see what response you get. And look into their eyes.
It depends on their age. Boys yes they will most likely find a girls period gross. Most men are mature enough to not find it gross but a part of life. If a man finds a womans period gross then he is more a boy then a man.
If you are asking the question you will need to shave your head. You will fail that test. As far as a UA coke stays 3 days, opiates 2-3 days, pot 30 days, some pills can stay and test pos for months. Also some rare people can test positive for life depends on the liver.