disrobing before a partner, removing the clothing of a partner or performing acts of physical intimacy, such as the touching of a partner's erogenous zones by the use of hands, tongue or rest of the mouth, may be regarded as indicators of the partner's desire for sexual activity and an erotic stimuli or turn-on (sexual arousal), which may generate erotic sensations in both partners. allowing such acts of physical intimacy, especially the stimulation of a partner's breasts and nipples, is an indication of reciprocal interest in sexual activity.