DH wont do it unless he has swimming trunks on! He finds it completely inappropriate for DD to be seeing his 'bits'. He's done this since she was 2 years old.
I still shower with DD (7) and wont stop doing it until she tells me she wants to bathe on her own. That said, if I had a son, id have stopped showering with him by the time he started primary school.
So it got me thinking, what age did you/will you stop bathing with your children, and is it different for your DH/DP?