Alcohol
The only "legal" drug in this short list of mind-altering chemicals, alcohol is widely available in most of the known world. Alcohol is primarily a depressant, although it small doses it may cause free-association that leads to violence where hostility already exists. Alcohol is used in a sexual context to "loosen one up," overcoming inhibitions to proceed to the sexual act itself; however, it is depressant effect may also cause temporary impotence.
Amyl Nitrite
Also known as "poppers," "Rush," "Locker Room," or "Head Cleaner." Currenly controlled in the US, although designer variants of butyl nitrite, isobutyl nitrite, and cyclohexyl nitrite are still available in some states. This drug relaxes the smooth muscles of the vascular system, resulting in a momentary "rush" that is primarly the result of oxygen depravation to the brain. Also relaxes the vaginal and anal sphincters and was once popular with gay men for that effect. Produces intense headaches in about a quarter of all users.
Cocaine
Sex on cocaine is frequently described as "the most intense in the world." (Of course, that is said about crystal methamphetamine, too.) Cocaine elevates the perceived effect of arousal, both male and female. Depression is a common post-high effect. Chronic use leads to full-blown paranoia, psychological dependancy, and impotence.
Marijuana
There is a lot of controversy over marijuana, and has been touted as "the most powerful aphrodisiac in the world." But neither marijuana nor any other drug will create passion where there is none to begin with. Many people who have used marijuana during sex have reported enhanced sensations, longer durations, and increased arousal. However, marijuana may also make sex more difficult because of its tranquilizing effect.
LSD-25
Lysergic Acid Diethylamide. A powerful psychedelic, most people who have tried to have sex under the influence of LSD have stated that their nervous systems were far too overloaded with basic sensations to try and engage in anything as complex as sex. For those who have succeeded, however, the effect as with all LSD experiences-- depending on setting and preconceptions about the experience, it can be exhilirating or terrifying.
"SPANISH FLY"
Spanish fly is a powder of ground up wings of the CANTHARIS VESICATORIA beetle, found in the deserts of Spain and the Southwest United States. It has the effect of irritating the outer mucous membranes of the vagina and the penis glans (head), thus bringing your genitals to your attention and sometimes giving you the impression that you are aroused. Women may also experience lubrication as a response to this irritation. However, the body is not actually stimulated, and intercourse is probably painful under these conditions, although it may sometimes help to scratch what really *is* an itch, and not desire. Spanish fly is also quite poisonous, and therefore illegal in the United States. Dosage is very hard to determine, as is quality, and you are just as likely to die from Spanish fly as you are to get laid.
