So let´s say Moon is in Libra. Let´s say the Moon starves Venus. Does the Moon get hurt through the starvation it causes to it´s own Lord?
I´m sure this has been commented and that Ernst talks about it but I don´t remember; please remind me.
Staffan
Psychologically moon hurts Venus as it focuses on it because moon gets intoxicated with unhealthy passion or addiction. Indirectly moon hurts itself too because it's focusing on wrong energy and causing itself suffering
I personally would refer to the LA masters course - Moon starving Venus. Essentially Moon is looking for happiness and fulfillment of its needs in the "wrong" places when aspecting Venus: the person expects other people/relationships to fulfill his/her deeper needs. Rather than looking to the self planets: Sun, Mars, Jupiter. My main takeaway from that video was the double whammy of 1) the person feeling responsible to make others happy 2) the person expects others to make them happy, and ultimately gets disappointed through unrealistic expectations.
But I guess you are asking more about a general rule - I don't believe there is one, at least not that I know of. It would very much depend on the specific planets/planetary relationships I reckon.
I´m pretty sure I remember that it does not harm the ruling planet but just it´s expression trough the sign the harming planet is in so in moon in libras case you might not make as good choices but it does not harm venus itself or your wife or verility for example. But I might be wrong.