Last year I did an astrology reading for someone who had difficulties remaining monogamous, and this was causing pain for his partner and therefore for himself. I looked at his chart and yes, there was Venus in Aries, enjoying conquest, squaring the Moon in Capricorn, his emotional base. So the astrology gave me a degree of insight, but not enough to say much that could actually help him.
I recently did a general Tarot reading for him, and it was this issue that immediately presented itself. The first card I got (the Significator, that describes the general situation), was the Knight of Cups. Here is the romantic adventurer, endlessly seeking the ideal partner. The card of past influences was the Hermit, which for him described how he felt when he was married: alone. Marriage was something he had entered into largely because that was what you do at a certain age.
Putting all this together, his present phase is that of a teenager, at the start of learning about love and relationships, even though he is in his mid-forties (don't laugh: we all suffer from arrested development in certain ways!) This is why he has difficulties with monogamy.
But it is a phase that will pass, rather than a fundamental part of his character. And, going back to his astrology, the transits he has in the coming years show this journey continuing, as firstly Saturn opposes his DESC next year - i.e. a bit of growing up, then Neptune conjoins his DESC after that, and he loses some illusions and barriers around relationships and is able to make more of a soul connection. And then Pluto square Venus followed by Pluto conjunct Moon. He has a ten-year journey of love and relationship ahead of him. But meanwhile it is completely understandable that he is where he is now.
Mick Jagger naturally comes to mind as the world's most famous non-monogamist (or is it Bill Clinton?) Anyway, Sir Mick (who was knighted a couple of years ago, I believe for services to women) was born 26 July 1943, 2.30 am, Dartford, UK. He has Venus in Virgo, which describes his preference for what he sees as classy women (i.e. those hosepipes in leotards that we see on the catwalk), along with his ability not to get too involved with them. Anyway, non-monogamy has been such a long phase of his life that we need to look at the progressions, and what do we find? In 1964, as the Rolling Stones got big and all these women became available to him, his Progressed Venus went retrograde, and has remained so ever since. BUT it goes direct again in December 2006. A 40 year reign is coming to an end! Ladies it is time to grieve! Presumably Sir Mick has been on some kind of extended journey, he has been learning something about relationship that has taken him a very long time. Or maybe he just can't get it up anymore. His latest hosepipe is a young lady called L'Wren Scott who is about a foot taller than him and claims to be quite happy about him seeing other women. Poor girl. I don't think self-knowledge is her strong point.