After further reading, it seems that estradiol must not be permanently lowered for too long due to bone density issues. However, the period for bone density issues to occur appears to be measured in months to years, and the positive bone density effects of lifting may need to be considered.
Additonally, the following study (
http://linkinghub.elsevier.com/retrieve/pii/S8756328204000596) does not concur with this link between estrogen and bone density, though well known in women, saying that for males "There was no significant difference in estradiol levels between controls and osteroporosis patients. ... This study therefore suggests that SHBG may play a key role in male patients with idiopathic or secondary osteoporosis." Exemestane lowers SHBG.
One thing to note is that after ten days of exemestane administration, estradiol was lowered 32+-29% for the population, whereas a single day's administraton lowered it 58+-21%. But most importantly, "contrary to the significant increase in testosterone observed after 10-d daily dosing, this change did not achieve statistical significance after a single oral dose."
So many variables to consider...