Decreased sexual activity and desire may cause a decline in serum testosterone of less than 10% in older men. (2015)
From the article:
Whether decreasing sexual function is a cause or an effect of reduced androgen status in older men, or whether some other age-related factor may be involved, is not clear.
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[…]
At both visits, the participants answered questions about their sexual functions, including, “How often are you able to get and keep an erection that is firm enough for satisfactory sexual activity?”; “How many times over the last month have you had sexual activity (including intercourse and masturbation) reaching ejaculation?”; and, “How much desire for sex do you have now, compared with when you were 50?”
[…]
Over two years, baseline serum testosterone, DHT, E2 and E1 did not predict decline in sexual activity, sexual desire and erectile function. By contrast, the decline in testosterone (but not in DHT, E2 or E1) over time, though less than 10%, was strongly related to decreased sexual activity and desire, but not to erectile dysfunction.