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The effects of exposure to constant light (CL) and blinding on male reproductive behavioral physiology of South Indian gerbils (Tatera indica cuvieri) were assessed. Exposure to CL diminished reproductive efficiency of males with a reduction in the proportion of ejaculating males. This is further evidenced by increase in the number and duration of intromissions and intromission latency. Concomitantly, reproductive organ weight and epididymal sperm count were also reduced. However, in weanlings CL did not induce changes either in their maturational process or their reproductive organs’ weight. Blinding of adult reproductively inactive males resulted in a considerable proportion of them exhibiting sexual activity, which is reflected in the seminal vesicle weight and epididymal sperm count. Blinded weanlings showed earlier testicular descent and higher seminal vesicle weight. These studies reveal that blinding (constant darkness) has a stimulatory effect whereas CL is inhibitory in the reproduction of the tropical rodent Tatera indica cuvieri. J. Exp. Zool. 289:59-65, 2001. (C) 2001 Wiley-Liss, Inc.