I really don't care about penises as long as they also show naked females. Full frontal guy? Then full frontal woman. Some kind of "equality", isn't it? And also, I understand that some people here would like guys for the TFs instead of women (friendly reminder here about the "Everything Else" section).
Anyway, the full frontal female nudity is not a must, but it is "more perfect" than avoiding nudity with smart camera angles
.