I have read several articles on women who have eunuch boyfriends and they say they are the best partners in the world. Because their natural machismo has been "curtailed", they become much more sensitive, cerebral in erotic fulfillment and gentle. They also become better at oral, which is great for the lassie! Their male aggression is gone, they become kinder, more considerate lovers (the woman's orgasm comes to be cherished, apparently) and many of them can still get erections.
I also heared men quoting that theory quite often.

My opinion: Don't be fooled.
Never take a women's word of what she wants.
Just my opinion, but... nothing.
My Opinion:
Women don't care.
As long as you do for them they don't care if you are eunuch or alien or anything.
But don't be fooled.
If she can get him and if he does what she wants, she will decide for the non-eunuch with a big "drive" and a big cock...
Sorry.