i'm not on any meds right now

Now that you mention it, I'd 50 mg of 5-HTP yesterday evening and today after lunch, and I do not have the desire to look at the beautiful pictures I store on my computer
When I do not take 5-HTP which is most of the time, I do feel like looking at sex related things like flicks or pics. I'm sure many will relate here.
It's weird though, it's like I get mentally aroused but not physically

I don't get this sense of physical arousal that should pair with the mental arousal. Hardasnails has pointed in the direction of low Acetylcholine, which might be correct. I see an increase in this sens of arousal whenever I have eggs or plain low-fat yogurt. But they also contain tyrosine so it's hard to say. I seem to recall that supps. of phosphatidylcholine didn't do much for arousal--perhaps I should have taken B5 with them.
See, I'm perplexed today because 5-HTP has caused this mental interest in sex, and usually when not taking 5-HTP this mental interest for sex is there, but it's the physical arousal that is not. Today both are absent. My overall motivation in life is pretty high, so DA must be fine, but I too nervous to get anything done........I have like a lot of project in mind, and this overwhelms me totally, up to the point where nothing gets done.
Is low Acetycholine something commonplace ? Not sure it is, cause I haven't heard very much about it on here.