Actually there are a few really great gay stuff stores in the castro. I cant remember the names but know exactly where they are located.
Go to castro st.
it wouldnt take more than an hour to walk the entire street to see all the cool stores and you will no doubt stumble onto the two in particular I'm talking about.
One is located at the corner of castro and market/noe.
It's near the corner bar twin peaks. Tons of really cool gay related stuff.
Then walk down castro towards 18th st. Hang a left a 18th and you will see another one past the midnight sun bar.
lots of cool jewely and other stuff.
I think there is another one on castro past 18th st.

But seriously, If you walk the 2 blocks of castro that is considered the gay shopping area, the one block to the right or left on 18th, that just about covers the castro.
Couldnt take more than an hour to cover.
Stop at Marcello's for some of the most kick ass pizza. (at the top of castro at market)

(and two of those suggestions do have a male bent on them, but they still have very cool neutral stuff as well)