There is female nudity in nearly every single episode. Buttocks and breasts (nipples included), mostly, although there is the occassional shot of the pubic region. It's not as graphic or frequent as, say, High School of the Dead, but it is still present throughout the whole series.

In one particular scene, a grown woman and a teenage girl shower together. Their breasts and buttocks are seen. Towards the end, it looks as if things may take a lesbian turn, though nothing of this sort happens.

A few sexual references and innuendo.

A group of about 7 women/girls are seen nude in a hot spring.

Two girls walk into a boy's room as he is sleeping. It is not shown, although it is implied that he wakes up with an erection and the girls see it. It is vaguely discussed in the next scene.

There are a few sci-fi fight sequences. The gore/violence itself would only get a TV-PG rating, maybe TV-14.

Mild profanities such as "ass" and "bastard." Also a few uses of "shit."

One character is almost constantly drunk. She also smokes occassionally.