People can be sexually aroused by different things and in a variety of situations. An arousal may be physical or mental in nature. A person may be sexually aroused by another person or by particular aspects of that person (eg.: hair color, build, smell, smile, etc) or by a non-human object.

When a person is sexually aroused by another person, it may be seen as an indicator of that person's sexual orientation. When sexual arousal is achieved by or dependent on the use of objects, it is referred to as sexual fetishism. This also includes sexual arousal which arises from another person's body part.

Most people are sexually aroused by a physical stimulation of an erogenous zone, especially if it is accompanied with the anticipation of imminent sexual activity.

In addition, some people may find nudity, erotica and pornography sexually arousing, though what aspect different people find arousing will vary. Most heterosexual males are visually stimulated by female nudity or partial nudity, while some heterosexual females are stimulated by the state of romance with their partner. According to the marital and sex therapist, David Schnarch, intimacy, the honest portrayal of the two people joining in the sexual act, may lead to a heightened state of passion in sex, including sexual arousal. Such sexual arousal may not lead to an actual sexual activity, beyond a mental arousal. In a 2004 study at Northwestern University, the female participants (both heterosexual and homosexual women) became sexually aroused when they viewed straight as well as lesbian erotic films. Among the male participants, however, the heterosexual men were turned on only by erotic films showing women; the gay males were aroused only by films showing men. The study's senior researcher said that women's sexual desire is less rigidly directed toward a particular gender, as compared with men's; and women's desire is more changeable over time.

Sexual arousal may also be assisted by a romantic setting, music, or other soothing situations.

Given the right stimulation, sexual arousal in humans will typically end in an orgasm, but may be pursued for its own sake, even in the absence of an orgasm.

Some people may experience a sexual arousal disorder. This may be characterized as a lack or absence of sexual fantasies and desire for sexual activity for a period of time. This may be caused by a mental disorder, such as depression, drug use, or some other medical condition. The lack of sexual arousal may be due to a general lack of sexual desire or due to a lack of sexual desire for the current partner. The lack of desire may be acquired (i.e. it may have started after a period of normal sexual functioning) or life-long (the person has always had no/low sexual desire).

Unlike most animals, human beings of both sexes are potentially capable of sexual arousal throughout the year; therefore, there is no human mating season.

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