

They’ve admitted that.
Someone at Pentagon was recently investigating UFO conspiracies and found that several kept looping back to them. And they realized that at least one was directly planted by themselves during the cold war to confuse the USSR about what weapons were real or not.
That NASA has done a zero-gravity intercourse experiment.
The 50th shuttle mission had married couple and it included spacelab. A pressurized and habitable module that could be isolated from the rest of the crew. Even before launch they were asked if it would happen, and denied it, as NASA has afterwards as well.
It doesn’t help that several of the listed experiments was about human health, developmental biology and included animals and eggs to study ovulation, fertilization, cell division and growth.