Seen many Cap man/Pisces woman couples. They all look like this:
http://trustedpsychicmediums.trustedpsychicme.netdna-cdn.com/wp-content/uploads/2014/10/Pisces-Woman-and-Capricorn-Man-Love-Compatibility.jpg
The Devil & the Angel. But take a good look at both their arms. Some parts of him become hers and some parts of her become him. They complete each other very well.
Cap men & Virgo are a common combo too. Caps click together with Taurus women too but more as very close friends rather than lovers. For some strange reason Leo & Gemini women find Cap men attractive too but this baffles me because they might find Caps too boring & Caps may find them too flighty.
Can't really comment on Cap women for LTR because Cap women have high standards. They are attracted to power signs like Aries, Scorpio, Leo, etc, I guess.
Cap men don't look for a power sign because they ARE the power. I really think Cap men are actually looking for a woman who knows how to look deep into his soul without him saying a word