>>12934180Estrogen receptors are much easier to bind to so there's a long list of chemicals in our modern environment that structurally resemble estrogen that bind to them. With testosterone you have synthetic steroids but the list from there is much shorter. There's probably mote compounds that bind to estrogen receptors and have a suppressing effect than there are compounds which bind to T receptors directly.
As for why this is you'll have to dig into some biochemistry and organic chemistry to understand why the structural motifs of estrogen are so common and why the receptor is such a slut
