There is a brief sex scene where we see a man suck a women's breasts. No nudity is seen but it is still a bit graphic.

One woman is briefly shown topless by a swimming pool.

We see Billy with a girl a few times, implying making out. No sexual activity is actually seen throughout the whole movie.

An alien disintegrates a dead body with a laser gun.

Most of the violence is unrealistic and involves lasers, like a cartoon almost. Plus, the film has a low budget, thereby being poorly put together and just being unintentionally funny.

There are some explosions, some of which are replayed.

Mild curse words are uttered

One character smokes weed

The aliens are a little frightening.

Whenever Billy transforms into a demon, he looks very scary.