Engineered Rabbit Penises

Researchers at Wake Forest University Baptist Medical Center's Institute for Regenerative Medicine have grown replacement penile erectile tissue for lab rabbits.

Functional testing of the implanted tissue showed that vessel pressure within the erectile tissue was normal, that blood flowed smoothly through it, that the response to nitric oxide-induced relaxation was normal as early as one month after implantation, and that veins drained normally after erection.

When the animals with the engineered tissue mated with females, vaginal swabs contained sperm in eight of 12 instances and four of the 12 females were impregnated.

The research holds promise for further advances with the possibility of developing treatments for men who have difficulty with the lazy-boy.