That's such an incredibly rude question to ask.
The correct responses are:
a) What a rude question! You must be so embarrassed that you asked that.
or
b) Well, trouble is, sperm just tastes too good.
( crackhouseceilidhband Fuck off back to Mumsnet, Mon 21 Sep 2009, 16:04, 3 replies, latest was 16 years ago)

I will be using approach A and advising Mrs V to use approach B
as these are both excellent
( Vipros. clever got me this far, then tricky got me in, Mon 21 Sep 2009, 16:05, Reply)

Hahahaha
I am totally going to say your option b) next time someone asks. That or I might just start carrying around a frying pan and when people ask I will THWAK them in the face, they'll soon learn.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Mon 21 Sep 2009, 16:06, Reply)

or
try and summon up a tear and say 'I can't have children' - that shuts the fuckers up sharpish.
however, response b) is a very good one.
( ascorbate, Mon 21 Sep 2009, 16:27, Reply)

using that has crossed my mind
some good friends of ours actually can't though, so I'd feel bad saying that
( Vipros. clever got me this far, then tricky got me in, Mon 21 Sep 2009, 16:33, Reply)

so?
good friends of ours were told they couldn't have kids, and we just found out they're expecting - it's a medical miracle, or something like that. which is what you can claim if you do find yourselves sprogged up.
( ascorbate, Mon 21 Sep 2009, 16:43, Reply)

that's nice
I'd be happier telling people who ask to get bent though :-)
( Vipros. clever got me this far, then tricky got me in, Mon 21 Sep 2009, 16:45, Reply)