And to clarify, testicles are not required for erections. Libido decreases with the loss of testosterone that would be produced if the testicles were intact, but it's not an absolute requirement. Also, loss of testicles doesn't mean no seminal fluid. Most of the volume of ejaculate is produced by the prostate, seminal vesicles and bulbourethral glands. Sperm from the testicles makes up only a small percentage of semen.
And this ends your overly-serious medical explication of the day.