I’m 38 years old . I eat clean , workout , do cardio , and overall healthy . No major diseases or conditions . But I never just feel horny and I find it difficult to get aroused/turned on even though my wife is very attractive to me . I get hard almost every night during sleep but sometimes for sex my erection takes a while to show up and I don’t feel that intensity of arousal . I’ve been tested at total testosterone of 542 ng/dL- well within normal range . But I’ve been told my free testosterone , though also in normal range , is borderline . When I take tongkat Ali , I swear within days of taking it , my erections come back faster and with less “work” required . I also get aroused more easily . I have read tongkat works by increasing testosterone, specifically free T. If this stuff works well for me , is this an indication my arousal issue/low libido/difficulty with erection is low testosterone? I do take other things like modafinil from modafinia and l tyronsine from organicessentialshub. I am going crazy trying to figure things out . Thanks .