I could be wrong, but I believe it helps with libido. Without enough estrogen to balance the testosterone, one's libiido will suffer. At least this is why I take it since gyno has never been an issue for me.
no, youre correct with that...
nolvadex is an antagonist/agonist, that depends on the tissue
that means in some tissues nolvadex activates the estrogen receptor (thats why it can be beneficial for lipids for example), in some tissues it blocks the estrogen receptor (breast tissue)
never heard the libido thing, but thats possible
however if you take exogenous testosterone you will never have TOO LITTLE estrogen