I posted awhile back a short bit about how I was castrated. Here are some facts. It was done a few years ago, in my mid 20's. From my understanding of biology, the fact that it was done well after puberty make a big difference. My voice is not any higher. I still grow a beard. I can even still have sex/masturbate. Only difference is no liquid comes out. But libido in general is way down.
I find myself thinking of transhumanism a lot more. Not in that it will restore libido virtually, just in that my mind isn't distracted. For me, it's not about life extension either. I give things a 32 year or so timeline, which means I'm not doing this to extend my life until the singularity.
So do it or not. The singularity will make my choice moot. But I rarely have regrets.