SEXY is S E X Y

Human sexual behavior or human sexual practices or human sexual activities refers to the manner in which humans experience and express their sexuality. It encompass a wide range of activities such as strategies to find or attract partners (mating and display behaviour), interactions between individuals, physical or emotional intimacy, and sexual contact.

Although some cultures hold that sexual activity is acceptable only within marriage, extramarital sex still takes place within such cultures. Some sexual activities are illegal either universally or in some countries, and some are considered against the norms of a society. For example, sexual activities with a minor is taboo as is sexual abuse of individuals in general.

As a basic instinct, the sexual drive can be expressed through activity without a partner, through masturbation and/or sexual fantasy, however "sexual activity" normally refers to acts involving at least two people.

Source: en.wikipedia.org