Those are the CGs, and you unlock them by seeing the CGs during gameplay. (If you have censored mode turned on, you won't unlock them, as they are NSFW CGs.)
I had it turned off
still didnt get em
then again I gess it did still sensor the penises, so maybe it bugged and kept it turned on even though I had turned it off
Interesting. No, censoring shouldn't matter for unlocking them.
I'll have to check, but last I knew, the unlocks were working correctly.