However, the sensations in both sexes are extremely pleasurable and are often felt throughout the body, causing a mental state that is often described as transcendental, and with vasocongestion and associated pleasure comparable to that of a full-contractionary orgasm. For example, modern findings support distinction between ejaculation and male orgasm. Orgasm may also be achieved by the use of a sex toy , such as a sensual vibrator or an erotic electrostimulation. It can additionally be achieved by stimulation of the nipples or other erogenous zones , though this is rarer. Orgasm by psychological stimulation alone was first reported among people who had spinal cord injury. Scientific literature focuses on the psychology of female orgasm significantly more than it does on the psychology of male orgasm, which "appears to reflect the assumption that female orgasm is psychologically more complex than male orgasm," but "the limited empirical evidence available suggests that male and female orgasm may bear more similarities than differences.