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Here is my problems with "statistics".  The statement "No significant difference in the report of sexual ideation was found..."  If you are the one women that had decreased sexual function after having your ovaries removed: isn't it comforting to know you are not statistically significant.  Come on.  Some did, and that is enough and should be considered significant.  This is a permanent change to these woman's lives and marriage.

Highly active men report better sexual function/performance than less active men, though less active men were not found to have ED or sexual dysfunction.

Good discussion of the arousal/sexual response differences between men and women from a physiological perspective.  

new study finds that men >65 with low libido and Testosterone levels < 275 increase sexual function with Testosterone therapy.  Only libido was improved; no benefit to erectile function was noted--note that is likely due to depleted NO.  Given time that should improve with he increase in NO synthase and thus NO.  I have a fault with on elf the comments on this study: they point out that increased free Testosterone and estradiol levels were associated with improved sexual activity.  This lacks an understanding of the physiology.  In men with low T > 65, the majority are dealing with inflammation and excess weight; all of which increase aromatase activity and thus estradiol activity.  This does not indicate that an increase in estradiol activity is associated with improved libido in men.  How can elevated estrogen levels lead to low T and then increase levels are associated with improved libido?  This is merely a reflection of the body's dysfunctional physiology.  This observation of increased estradiol by no means shows cause and effect.  Scientists need to due a better job in vetting what they write!

sexual dysfunction found more in women with metabolic syndrome versus healthy women.

Sexual side effects often persist long after SSRIs stopped

This study found no benefit from DHEA at 50 mg twice daily for those with androgen deficiency and sexual dysfunction.

Increased aromatase activity and resultant estrogen production negatively effects libido in HIV men.  I don't believe that this effect is just found in those with HIV, but can be extrapolated to all.

Beta blocker therapy resulted in decreased sexual activity and serum Testosterone levels compared to AARB therapy.

Testosterone, estradiol and sexual function in men

Men with sexual dysfunction found to have higher E:T ratio and higher Estradiol overall.  This was a retrospective study.

rat study finds that zinc supplementation increases Testosterone and prolactin levels, which increase sexual performance.

A systemic review of Testosterone benefit in men stirs the pot.  I can't say that I agree with the majority of their conclusions.  What I do agree with them on is that the majority of men on Testosterone therapy likely don't need it and are simply using Testosterone as a drug.

Elevated Prolactin level plays role in ED and reduced sexual activity in men.

somewhat flawed study in that they looked at serum sex hormones to evaluate men with gynecomastia compared to controls.  A better eval would have been of saliva or blood spot.  Free levels will show more subtle changes physiologically than will serum as to the sex hormones.  The study did find decreased sexual function in the men with gynecomastia--indicating hormone issues not picked up by the serum.

low dose of BPA in rat model finds delayed sexual maturation.

BHRT shown to be significantly better for sexual  symptoms than with conventional HRT.  78% vs 33%.

Low Testosterone is a very significant problem in men with type II Diabetes.  Estimated to reach 40%, likely much higher.  They based these estimates only on T levels and sexual symptoms. Testosterone improves glycemic control primarily through Increased transcription and transloction of GLUT4 insulin receptors to the cell surface.  Inflammation reduction is also a mechanism.  Testosteorne lowers Triglycerides in the traditional lipid profile.  Studies are mixed on the other aspects of  lipids.  

Meta-analysis finds bias in industry studies versus independent studies.  No surprise there.   Testosterone in this meta-analysis was found to aid sexual dysfunction in men with hypogonadism.

Study finds no improvement in sexual desire and/or ED in older, obese men with Type II diabetes by Testosterone therapy over 40 weeks.   There is so much wrong with this study.  The authors, by design, assume that Testosterone is all there is.  No assessment of Testosterone metabolism and or its effects on inflammation was designed into this study.  These men are known to have increased inflammatory cytokine production and likely are aromatase dominant.  Given these men Testosterone may just be throwing fuel on the biochemical fire.