Leo Asc/Aqua Desc, Gemini Sun
I have Uranus in my 4th, but Uranus rules my Desc, so I can relate to all these posts. In my experience, the desc. ruled by Ura reflects more on the partner than the chart owner. For me, I only cheated once in my 1st relationship, but it was kind of an open undefined thing with a girl who was cheating on her bf in another state. Freshman year in college, just a drunk one night stand. My 2nd relationship was long distance, and pretty stale, so I had a hookup, but I was just a 20yr old male being a 20yr old male I guess.
But I never cheated or seriously thought about it with my last 2 relationships, both of them being serious, with marriage in mind. Im 31 now, so more mature. I still do need a lot of freedom, I hate having to answer to anyone, and need a lot of room, so only very few types of females would be a good match. They would need a degree of freedom themselves, but their moon sign is more important if it's female! My 3rd relationship was with a Scorpio Sun/Moon who was very manipulative in trying to get me to marry and have kids. Would also play deadly jealousy games by allowing other guys to court her while we were together. Her sun was conjunct my natal Uranus, so she was prone to doing and saying strange things out of the blue, pretty erratic and could be a nervous wreck if things didnt go her way.
My last g/f was also heavily influenced by Uranus, as the planet conjuncted her natal Pisces sun in the past couple of years. It started out as a cool Aquarian friendship over the net, but her Cancer moon made her clingy. Never cheated on her, barely payed attention to other woman in terms of chatting. All Im guilty of is looking at eye candy, but never touching. She has her Venus in Aquarius which makes her pretty friendly with everybody, including males, and some of her behavior behind my back could be mistaken as infidelity depending on how you look at it. Me, personally, I think hanging out with males at a bar is just asking for trouble. But Uranians/Aquarians live by their own rules, so it's impossible to really convince them that their behavior is weird, or socially unacceptable. So with my last 2 relationships, I found myself having to explain to these weirdoes that hanging out with other guys when you're in a relationship is a no-no. My Saturn in Leo asc, is all about respecting the man's wishes, esp when it comes to not making him look bad.
So although the 7th reflects on the 1st, it has more to do with the others, rather than the chart owner itself. Keywords for my relationships have definitely been unstable, erratic, neurotic, weird and it's actually my mates who seemed more prone to changes of heart out of the blue, and drifting in the direction of promiscuity, and open relationships.
I recommend the best way to gauge the likeliness of someone's infidelity is to see how Saturn aspects Uranus in their chart. I would say there's truth to the unconventional tastes part, but this could be shared with an unconventional partner, so doesnt have to turn into infidelity unless one starts to like weirder and weirder things (I heard about an Aquarius I once knew, whose tastes went from unconventional to illegal so be careful). In general, you never know what to expect from an Aquarian Sun,Moon,Mars or Venus, so check to see how much weight Saturn has in their chart. Saturn in 1st is a great checks and balances system, which for me, works out as a look but dont touch policy.
But for the record, I think for a male with Uranus ruling the dsc it shows the female partners in his life being more prone to erratic behavior, and breaking the traditional rules. But then again, that just may be his type!