you loose your sexdrive on letro because it has the ability to remove up to 96% of all the estrogen in your body, no sex drive during contest time is what you trade off for being super dry because of basicly having no estrogen to cause water retention
nolva does nothing for water retention btw, its a SERM which means that it binds to estrogen receptors in your breast tissue(to alot of other tissue too) so they can't be activated by estrogen therefor preventing gyno..
letro is an aromatase inhibitor meaning it makes testosterone unable to convert to estrogen at all
if you want a better alternative that won't destroy your sex drive try aromasin or arimidex at relatively low doses, will bring your estrogen to natty levels while on cycle
sexdrive wise theres not alot you can do besides downing cialis, but that won't get you in the mood if you are close to having no estrogen in your body at all