Aphrodisiacs typically consist of various chemicals that influence hormone levels, particularly testosterone in males and estrogen in females. These substances can be derived from cholesterol and may vary widely, with potentially hundreds of effective preparations available. The discussion highlights the role of hormones in sexual arousal and mentions PT-141, a hormone-related substance, as well as Viagra, a well-known non-hormonal drug that contains sildenafil citrate, which is often associated with increased libido. Testosterone is noted to enhance sexual desire in both genders.