Both Scully and Mulder are occasionally seen in their underwear.

A woman is shown waking around the facility in the nude. Though her body is hidden by objects, it is clear that she is naked.

There is a woman wearing very revealing mortal combat style clothing her entire butt is visible multiple times wearing only thong like underwear

Lengthy and explicit discussion of sex abuse.

Mulder flips through a calendar containing women in bikinis.

Occasional mentions in dialog of pornographic magazines and videos. Nothing explicit is ever shown on screen.

A few episodes contain sexual violence, both depicted and portrayed.

Certain episodes feature occasional sex scenes (actions, no nudity), in general once or perhaps twice per season. Characters on a few occasions in stages of undress, rarely though in a sexual nature (more sleeping, occasional bathing interruptions) and prostitutes occasionally crop up, as spies, information sources etc.

An episode features a naked Neanderthal woman. Though we never see any sexual content, brief shots of partial and rear nudity is featured in the episode.

An episode revolves around a woman who was raped by supernatural entities, she is shown thrashing around in a bed (fully covered) and later seen badly bruised and mentally scarred from the ordeal.

An episode revolves around a family resulted from years of incest.

Scully is a medical doctor and performs lots of bloody, graphic surgeries in pretty much every episode.

A small child is hit by a train and killed. This is offscreen but still upsetting.

Home is by far the most violent episode. It has alot of onscreen murders, and has a death of a baby

The show is shockingly violent and gory at points, although infrequently so.

Most episodes have horror elements, some with gruesome creatures and behavior. Some episodes have violence, including stabbings, gunfights, and physical violence.

A lot of the violence in this series is offscreen, but injury detail occasionally intense with some closeups of corpses, injuries, blood and on a few occasions gore. Certain episodes deal with topics of pedophilia and child murder. Many episodes in later seasons start to get very gory and gruesome

Bitch is used infrequently alongside lesser profanity like ass.

Detailed drug misuse in some episodes.

Characters drink and smoke socially, and one recurring character dubbed 'The Cigarette Smoking Man' is seen smoking in virtually every scene he is in.

In one episode, teenagers are depicted to be high on some home-brewed, meth-like concoction.

Some episodes have very scary and disturbing scenes not suitable for younger viewers.