This. It's the only way to know.
I went on my first date ever (I am in my mid 20s) on Monday with a 4/10 black foid, this was while accentmaxxing as a British guy in America. I was on the verge of taking the bluepill since she came with me when we switched bars twice, and was willing to converse fluidly. We spent about 3 hours together. At that point I had never had as much social interaction with a foid who wasn't a full blown prostitute.
I found when I tried to kiss her that she had no real interest in me and was just using me to try expensive drinks (all the bars we went to had been suggested by her). She recoiled and told me I was drunk (I was, but that was the only way to stay low inhib enough to not be "boring"). I then asked her if she doesn't find me attractive, and she said "well I wouldn't say that *exactly*". She then told me she had a boyfriend in an "open relationship", but she "doesn't do hookups", which made no sense at all. At that point she made some kind of excuse and left.