I have found that these days, the justifications that women give themselves for their affairs are as varied (and similar) as their male counterparts' excuses, SGB. Some women claim the reasons you cite, just as some men claim that they are below the cat in the domestic pecking order. We've had lots of female posters on here who claim the "no sex" justification, just as men have always used the "my wife won't have sex with me" disclaimer.
Some of the worst delusions about affairs occur when the affair partners are both attached to other people. Very often, the female partner will say she is doing this because her H is abusive and unkind, but is quite happy for her lover to be abusive and unkind to some other woman, by having a deceitful affair. And the male affair partner who claims he is doing this because his wife doesn't adore and respect him, but is only too happy to hear his OW trashing her H to bits and implementing a sex ban at home.
People really should read the label on the tin....
However, to broaden out what I think was an excellent point that you made SGB about the culture still being disapproving towards female sexuality, I believe that this culture blinds some women when they have affairs. Because they cannot give themselves permission to have sex without love, they convince themselves that they have fallen in love with their affair partner and hence, their marriage is doomed. It also leads them to sanction their desire for their partner to jettison his own wife and family, on the altar of "love".
Because men have been conditioned very differently and have been able to separate sex from love more easily, they don't have the same compulsion to fall in love with an OW and ditch their marriages and families.
It doesn't make logical sense that men are inherently more loveable than females and yet more females fall in love with male affair partners than the other way around.
I think that's a cultural structure and nothing more, but whereas you might expect more women to become more "male" in their thinking about affairs, in fact what I am seeing is men becoming more "female" in their thinking and telling themselves that they must "truly love" their affair partner to be doing this, feeling compelled to leave their long-term partner, for what was often a simple crush.
I still think it is very hard for women to allow themselves to pursue no-strings sex, or to do so without societal approbation - and I think that's wrong and sexist.
Just as I also think that deceiving others about your choices is wrong and indefensible.