What evolutionary model for the maintenance of sexual reproduction do the following data appear to support? 
Definitions:
Scrotum
an external sac of skin that encloses the testicles in males, regulating temperature for sperm production.
Epididymis
A tightly coiled tube situated at the back of the testicle that stores and carries sperm.
Sexual History
An account of an individual's sexual practices, partners, behaviors, and any sexual health issues, often discussed in medical contexts to assess health risks and conditions.
Masturbate
Self-stimulation of the genitals usually to achieve sexual arousal and pleasure.
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