ha, i didn't think so, but i've noticed you mention sex and amphetamine together in a few posts, so i thought doctors might be prescribing it for that off-label or something.
i think the "sex being the only recreational thing you can do on d-amp" might be a subjective thing. i'm not really into just taking speed for the "jacked-up" feeling myself (some people definitely are), but i do find that it can help enhance other things you are doing recreationally. for instance, 1/2 the people i went to college with wouldn't have been able to make it through gamedays (serious binge drinking spells for home football games in college for those from other parts of the world) w/out some sort of upper to keep them going. so in that sense, it can really help you engage in other types of recreational activities--ha, in that example substance abuse-- w/out passing out early or acting like a moron.
for me though, i don't find that it particularly inhibits my ability to engage in any other sorts of recreation--sometimes it can enhance other activities, like you said. for instance, it can make concerts more enjoyable; it can help you get more into a movie. i think it's absolutely correct to say that associating it with an activity can make it more recreational; i just don't think that activity is limited to sex (though sex is pretty great no matter what)-- and it can make otherwise entirely dull activities seem interesting.
i personally don't think it's that similar to mdma in effects at all. i've been prescribed either adderall or ritalin daily for 17 years now, and i have probably done ecstacy a few hundred times in my life, so i think i can compare the two with a pretty good amount of firsthand experience. yes, they both make you hot, and they both make you stay awake, but the similarities pretty much end there imo. i'm not into raving or dancing or anything like that; when i was in undergrad, we used to take rolls just to go out to bars all the time and stuff like that.
i find mdma to be a pretty euphoric substance, and i don't do heroin, but w/ any other opiate i've taken--or any drug for that matter---i don't find the substance alone to create a great experience. i usually like to be doing other things when i take any drug. i know on tv it looks like opiate users just like to fall backwards and stare at the ceiling, but literally the only drugs i've taken that have created an experience that could be interesting in and of itself have been strong hallucinogens. even then, i can't imagine it would be that great to just sit around your house alone tripping.
i think it's really only once someone passes the point of recreational use of a substance that they start isolating and doing drugs alone all the time. when i first started using opiates, they made me want to go out and talk to people and enhanced other activities like most other drugs tend to for me. although it's a different high, oxy especially has some very stimulant-like properties to it. it makes you want to go out and accomplish things, gives you confidence, etc. like other drugs, it starts to have the reverse effect as you become addicted, but that's not unique to opiates.