Capricorn is an earthy sign.
Earthy Capricorns sexual nature is as powerful as his earthy aspirations. Capricorn lovers will remain aloof and would not like to make a first move until of course s/he is truly in love.
Sexual intimacy and expression has to be developed over a period of time. They have a very serious and aloof attitude hence they miss out the fun in sex.
After the passion wears off usually the relationship spells trouble however sexual relationship without any emotional involvement can be exciting.