Currently expecting dc4, am very undecided about whether to find out the sex or not. Didn't with any of the other 3 and enjoyed the 'surprise' of finding out after the challenge of labour and birth, but am very tempted to find out this time.
I suppose mainly because of planning issues - this is def our last, and I could start giving away baby clothes we wouldn't need to clear some (much needed) space, as well as planning ahead for bedrooms/sharing with siblings etc.
Anybody find out the sex of their baby and wish later they hadn't? Or not find out and wish they had?