Dh and I agree we won't be lying to our soon to be born child about anything. We both know how much it can fuck any relationships up and undermine trust.
Massive argument with MIL recently about santa. She thinks we are being ridiculous to not want to tell a pointless lie more often than not used to control children's behaviour. I think there is enough beauty and 'magic' in the world already without making shit up. I'd rather teach them about that.
Also our kid is going to get lied to enough by everyone/thing else in life so why would we want to add more?
And lying to avoid awkward questions is just a lazy cop out. In this day and age a kid is probably going to find out about sex and stuff like that pretty young anyway and I'd rather tell them myself if they asked than them find out some half baked version from wherever else.