Androgens and male sexual function.

Sexual symptoms are the most specific determinants of low testosterone observed during adulthood.

• The review used preclinical and clinical observations to summarize evidence supporting positive relationships between endogenous T levels and sexual activity in adult males.
• This is described as a narrative review with an updated meta-analysis component evaluating effects of testosterone replacement therapy (TRT) on sexual functioning.
• The paper characterizes sexual symptoms as more specific than other symptoms associated with hypogonadism.

TRT improves several aspects of sexual life, including erection, in symptomatic hypogonadal men.

• The authors updated a previous meta-analysis evaluating the effects of T treatment (TRT) on sexual functioning in subjects with T deficiency.
• The effect of TRT on sexual function was characterized as 'rather modest.'
• The improvements were observed across multiple aspects of sexual life, not limited to erectile function alone.

The effect of TRT on sexual function is lower in subjects with associated metabolic conditions.

• Subjects with comorbid metabolic conditions showed diminished response to TRT compared to those without such conditions.
• Despite reduced efficacy, TRT combined with lifestyle interventions is recommended specifically in symptomatic hypogonadal subjects 'especially in the presence of comorbid metabolic conditions.'

The effects of TRT on sexual functioning are similar in magnitude to those derived from lifestyle intervention.

• The specific observed sexual function effects of TRT were described as 'similar to those derived from lifestyle intervention.'
• Similar data supporting the parallel between TRT effects and lifestyle effects were derived from animal models.
• The authors note that lifestyle modifications should be the first step to promote weight reduction.

TRT may improve body composition and thereby increase willingness of hypogonadal subjects to perform physical exercise and adhere to healthier behavior.

• The authors suggest a mechanistic pathway whereby TRT results in body composition improvement.
• This body composition improvement is hypothesized to improve 'the willingness of hypogonadal subjects to perform physical exercise and to adhere to a healthier behavior.'
• The authors describe this as a reasonable supposition, indicating it is not yet definitively established.
• Animal model data supported this proposed relationship between TRT, body composition, and behavioral change.

TRT can be combined with lifestyle interventions only in symptomatic hypogonadal subjects, particularly those with comorbid metabolic conditions.

• The recommendation explicitly limits combination therapy to 'symptomatic hypogonadal subjects especially in the presence of comorbid metabolic conditions.'
• Lifestyle modifications are identified as 'the first step to promote weight reduction,' positioning TRT as an adjunct rather than primary intervention.
• This recommendation reflects both the modest effect size of TRT and the comparable efficacy of lifestyle interventions.