Some of us involved with leftwing politics had previously been witness to or victims of men who had sexual access to as many women as they wanted, while women waited for her one partner to get round to paying her attention. In the meantime, women were pitted against each other while the men played a subtle game of divide and rule, and there were plenty of women to do the washing, childcare and provide emotional and sexual support for these oh-so alternative men.
The women were not necessarily any more sexually liberated than their married, monogamous sisters; in fact they would quite often complain of being treated far worse than a wife. It not only gave men permission to sleep around, but left women experiencing dreadful feelings of anxiety, low self-esteem and lack of confidence.
Sounds like the SWP really.