Ah ha, thanks! I thought as much, but no harm in asking! 

...or is there? 

Just noticed, when selecting these "nude" clothing options, my sims manhood is cut out, and I revert back to barbie mode (apart from when in the shower or bath). I have the updated penis model thats floating round on Sexy Sims with the "adjusted positioning" etc.

Does this happen for everyone, or is this just a "me" thing?