Im not sure what the mental psychology is there, but yes. Once the guy can break into the comfort zone, the gloves come off, the handcuffs come out, and you get to deal with potentially very horny and needy women.
I would almost bet that thr reserved nature there before the relationship starts may have less to do with men and more to do with other women. We just want to be seen as sweet and nice and compassionate and cute and reserves while also being elegant and mysterious. This is because we love to judge each other into the ground. Didn't fix your hair one day? You must be having some kind of secret breakdown. No makeup? You must be depressed and sad. Didn't have a cheerful enough greeting? You must not like me and I did something wrong what is wrong with me now I will worry about this for a week.
