In love, Pluto in Capricorn rarely shows itself straight away, because for these people closeness tends to arrive through responsibility rather than through a quick infatuation. First they weigh up whether anything lasting can be built with this person, and only then do they let themselves feel. I often notice that they choose partners beside whom they sense some structure: clear rules, a clear domestic life, a reasonably clear tomorrow. Chaotic relationships, the "let's see how it goes" kind, tend to wear them out faster than they'll admit.
Once inside a relationship, the old habit of carrying everything switches on. They become the one who decides, who plans, who's responsible for the joint budget, who organises the holiday, who keeps the dates in their head. The partner can quietly slide into the role of the younger one, and then closeness gets swapped for something closer to parenting. That's one of the main traps of this placement, and it's worth naming out loud before it sets. The reverse can happen too — an older partner gets drawn in, someone beside whom they can finally stop being the grown-up, and then a dependency forms that's hard to unpick later.
Around sex and intimacy there tends to be a theme of control. Letting go can be genuinely difficult — doing nothing, not leading, not steering. The relaxation that does come tends to arrive with age and with trust, slowly, rather than on demand. Romance, for them, isn't usually flowers and surprises; it's the feeling that a partner will hold, won't leave in a hard year, will still be there when things get heavy. The strongest sense of love they tend to feel isn't at the peak of passion but on a quiet evening in the fifth year, when it lands that this person walked through their long winter and didn't break. None of this is fixed in stone — it's a pattern worth noticing in yourself, not a script you're bound to follow.