I myself had taken enough anti-androgen to have permanently closed down my balls, though they have not yet been cut out. I have also been with Thai T-girls who have started hormones since puberty, so similarly completely shut down their testes already and with the help of estrogen, developed smallish breasts.
With testosterone cream, gels, or shots, and/or with the help of such things as Viagra, hard ons are possible. But often, they are not strong enough or last long enough for penetration.
With estrogen, T-girls can get libido, but more like a woman. The two T-girls I was with, they got hard - harder than me. They did not really like all my attention on their penises. And they shot their loads faster than me, on both occasions. Like myself, the load is clear, basically similar to pre-cum, because it is only secretion from the prostate glands. It is much less sticky than normal cum. Yes, the taste and smell is the same as normal cum.
My understanding is that castrated girls (and guys) can do the same too.
Hope this clarifies for those who have been wondering.
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Smoothie 
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