Sexual polarity. I'd send you to a great source on it but not on this site. David Deida says sexual polarity where one is masculine and the other is feminine in their energies is necessary for an exciting relationship. He says if the polarities of the people are similar they can be friends but the spark won't be there. He also said men can have feminine energy and women can have masculine energy.
What do you make of that?
What do you make of that?