not to sound like a dick, but that's a gross oversimplification. Granted DA/NE releasers tend to make people horny, but a lot of times they also inhibit performance as they cause vasoconstriction. Also, LSD doesn't release DA, or any other monamines for that matter (that i'm aware of). There are some who think it does cause some 5HT efflux, but I doubt it. All this being said, DA levels will be elevated (specifically in the VTA & nucleus accumbens) when you do something pleasurable, as its involved with reward, but this happens when you eat, do well on a test, enjoy another's company, etc. Even if an LSD trip is extremely pleasurable i highly doubt enough DA would be released to cause a significant deficit or one lasting more than a few hours, if at all.
While it is possible that you were so satisfied from the trip you haven't had much desire in that arena, I would guess that its more related to the general change of focus that can be common post-LSD experience. Its very common for people to become more interested in things like ecology/environmentalism, certain aspects of public policy, finding innovative solutions to problems or barriers in their chosen career path, etc, post-LSD. If you're spending a lot more time thinking about these things, sex is likely to seem less important.
And from my own personal experience, at points in my life i've been way too preoccupied with sex to focus on more important long term goals, and not realized the implications for this until i had taken i psychedelic (albeit not lsd). Hence i reduced the amount of time i spent any given day trying to keep my dick wet. Definitely a positive change.
Also, how old are you? Male or female? and are you taking any medications? these are all factors in sex drive, as well as many more.
