McDonnell, S. M., & Henry, M. B., F. (1991). Spontaneous erection and masturbation in equids Proc 35th. J. Reprod. Fert. Suppl, 44, 664–665. Keywords: Horse; Masturbation; Erection; Aversive conditioning; Sexual behavior; Ejaculation; Semen Permanent link \| Save citation: RTF