Capricorn's symbol is a goat climbing up a mountain. Goats are legendary in all of classical mythology and literature for their horny behavior and omnivorous appetites.
Although Capricorn is a very lusty sign, he does not want to be perceived as yearning or too eager. Part of Capricorn's charm is the self-discipline he can maintain. His exterior may be cool, but passion lies underneath.
The mountain that the goat climbs symbolizes success, and Capricorn wants to be successful in all endeavors — including sex. Since people usually don't get medals or public recognition for being good lovers, your Capricorn mate wants to know in detail how he rates. He is a pragmatist, after all, and wants to see what works and what doesn't. The sign is not prudish and can be very interested in the particulars of whether this position or that technique was as good as the one the night before.