When meeting new people the conversation usually gets round to children. When I say I don't have children the first question, invariably, is to ask why (a question I think is rarely rude and invasive). I always reply that I didn't want children which usually results in my being treated as weird or a child hater (neither of which is true, alright I may be a little weird!).
If a child wants to smile, wave or talk to me I will smile wave or talk back (provided a parent is present) but I knew at an early age that I don't have a maternal bone in my body. I like children, just didn't want any of my own.
So the question I am asking is, the next time someone asks why I didn't have children should I lie and say I couldn't? Of course that could then lead on to further questions about the "problem"
Engagement Party and then Hen Party
Welcome card for new Vietnamese neighbours?
Ha! Ha! Haaaaaaaaa! An OBE in exchange for the State Pension?

I like H1954’s suggestion - why do you need to know? I don’t think you should give any explanation such as couldn’t have them/didn’t want them/thinking of the planet. It’s not their business and you don’t have to justify yourself to anyone. 
