History is weirder and more wonderful than we can ever imagine:

And everyone in town seemed to have an opinion. When William Barton was sued for divorce on grounds of impotence:
Several women also inspected William Barton’s genitalia, including one who agreed that William’s “rod and testicles appeared sufficient to serve and please any honest woman.” But some women had less glowing comments about William’s genitalia, supporting his wife’s accusation of impotence. Robert Lincoln, however, countered that these particular women had handled William’s penis too roughly and with such cold hands that “on account of shame, his rod retracted itself into William’s body.”
I can see porn stars as neutral court-appointed expert witnesses these days.