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So lets take your guy.31/2+6= 21,5 so yeah its creepy. But you are an adult so its your choice, but remember that he is technicaly too old
I don’t know where the formula comes from, but seems accurate.
I don't know saw it on some youtube video, can't remember who it whas but he Said that he got it from his friend in colleage and he got it from his friend and so on, it works all the time tho so yeah.
That's the advice I always give! Make sure that you and your partner are generally in the same place in life.