Imipramine-Induced Erection, Masturbation, and Ejaculation in.pdfVIP

Imipramine-Induced Erection, Masturbation, and Ejaculation in Male Horses Received 30 October 1986 Stallion Sexual behavior Imipramine Erection Ejaculation Tricyclic antidepressant Yawning HORSE stallions, like primates, are single-mount, multiple Accordingly, this behavioral sequence is viewed as mastur- thrust ejaculators. Erection of the musculocavernous penis bation. Among domestic horses, masturbation is commonly must occur before intromission can be achieved. The penis observed in stabled stallions, but also occurs in stallions at of the stallion at rest lies withdrawn into the preputial sheath pasture with other horses (McDonnell, personal observa- within the inguinal region (Fig. la). It protrudes from the sheath tions). Free-running feral and wild stallions, both harem [6] for urination and during sexual activity. For urination, the and bachelor (Berger, personal communication, 1987) band penis usually protrudes less than full length and remains stallions, also exhibit erection and masturbation in appar- flaccid (Fig. lc). During sexual excitement, the penis reaches ently nonsexual contexts. its ful! length as erection proceeds (Fig, Id and e) via The dibenzazepines imipramine and clomipramine, used engorgement of the corpora cavernosa and spongiosum. Dur- widely in humans as antidepressants, are known to influence ing copulation the glans penis enlarges up to four tim