Mars in Aquarius doesn't love through the body or through status — it loves through interest. I keep seeing the same scene play out: a person walks past perfectly suitable candidates for months, blank-faced, and then in a single evening catches fire for the one they've just spent three hours arguing with about artificial intelligence or the state of the schools. What switches them on is the thought, the conversation, the project. When the thinking runs out, so, often, does the pull.
In a relationship this Mars needs air. It copes badly with being kept on a short lead, with the detailed questioning about where they were and who they spoke to — not because anything is being hidden, but because the interrogation reads as distrust of their freedom. Push a partner like this and they rarely make a scene; they cool slowly instead, and one morning they're simply somewhere else, miles off, without ever having shut a door loudly.
For all that, they can be deeply loyal — only the loyalty runs through a project, through a shared design for things. A couple who are building something together tends to hold for years. A couple who merely live under one roof can quietly lose each other inside two or three. The difference isn't the depth of feeling so much as whether there's a living idea between them.
The erotic side of this placement runs through experiment and consent, through unconventional formats, through a kind of intellectual play. The script-free, by-numbers version goes stale fast. In my experience the strongest unions for this Mars are with people who can argue, will happily experiment, and can also leave their partner alone for a day without taking it as a slight. That last part isn't a passive shrug — it's a grown-up steadiness. Where both sides have it, the relationship turns into a resource rather than a cage. None of this is fixed in stone; it's a pattern worth noticing in yourself, not a script you're bound to follow.