 Sexual pleasure is a third criterion: “Those activities … are sexual … which give rise to sexual pleasure” (Gray 1978: 191–192). But the production of sexual pleasure is not necessary because many acts do not produce such pleasure; and this criterion conceptually rules out non-pleasurable sex (Soble 2006a: 21–22). It might also not be sufficient: a man might see someone on the street and feel a twinge of sexual pleasure (Soble 1996: 130). The presence of sexual pleasure in this case does not suffice for the man’s experience to be sexual activity (perhaps if the man continues to look the experience becomes a sexual activity because of his intention to keep looking; Soble 1996: 130).