There's the very common response from men of "What? Why? I have loads of sperm!"
Well thats terrific, I'm glad you have spoo a plenty.............. and your point is............?
then there was the:
Mr X "Is that your bull there that you're standing with"
Me: "My what sorry?"
Mr X "You're bull you know (wink wink nudge nudge)"
Me: "Oh, this is a work colleague of mine, I believe he's still human"
Then there was the particularly charming "Mate, I'd have given you sperm wherever you wanted it, the face, the chest ha ha ha"
I didn't think this one really warranted a response, I just smiled.
There have been a few awkward and confused "Well, um, wow, well, um, well, good on you."
and lots of "Cool how do they put it in?" again with these ones a polite smile and a 'oh look there's someone less neanderthal across the room I need to talk to' look seems to do the trick.
Women on the other hand have asked for all the details. How did you choose? Where do you go? Is it expensive? Was it painful? How do you feel?
And then there have been plenty of congratulations! thats brilliant! and well done's too.
All in all I feel so good, strong and courageous about my decision I'm not remotely bothered what the response is, but I do always find them interesting.