Make sure they check: - testosterone (again) - prolactin level (elevated prolactin, often due to a tiny benign pituitary growth, can cause loss of libido) - fasting blood sugar (diabetes can cause this) - cholesterol (atherosclerosis can cause this)
Of course, depression can also cause a loss of libido (and unfortunately, so can the drugs to treat it).
I have a theory that, in some WASs, the start of the loss of libido played a factor in the affair. When your sexual function is flagging, you may still be able to "get it up" for someone new or exciting or kinky (which may explain some weird choices MLCers make) because of the increased arousal, so they begin to think the problem is they're "not in love with you".
Stress to your H that this can be a warning sign of some dangerous medical conditions and you don't want him to drop dead of a heart attack.
