Wow! i can hardly believe that you are discussing this, i was recently talking about this with a friend.
This must be a jw trait.
I remember a situation that happened shortly after leaving wt hq. i was invited to meet at a friends home before going out to dinner. as i drove up to the house, a sister was standing alone outside. i asked if the others had yet arrived. she said that others were in the house, but since she was the only woman she did not want to go inside with only men and decided to wait until other females arrived. i found this strange since everyone inside were her 'brothers' in the faith.
another time, my boss asked me to drop some items at his home one weekend. upon arriving, his wife told me that he had to step out, but wanted me to wait until he returned. she offerred me something to eat and drink. we were alone, but had a very nice conversation until he came in about a half hour later.
it was so surprising that these wicked worldly people had so much trust, while jws panic anytime a man and woman are alone.
i have so many weird jw quirks to get rid of.