There are various scenes shown inside a brothel. Hints of naked bodies are shown as a person walks through the halls. A woman's bare back and lacey / see through skirt are shown (from behind)

None. There are no sexual scenes or obvious nudity shown in this movie.

A man briefly observes a couple obscured by bed sheets having sex and making sexual sounds on a surveillance monitor .

2 drivers are obliterated into a puff of red (bloody mist?) by an alien weapon. this happens again later to another human

A man attacks an alien and gets stabbed by its sharp "quills"

A man is unwittingly used a human bomb. only the explosion from afar is shown

People have "bugs" surgically removed from their necks. (Not horribly gory in the end.)

People are taken, some are beaten, others are shot. Some dead bodies are shown, but not too much blood.

3 F words, but one is muffled. This is proven by subtitles. 1 B.S. word, 2 S words

5-6 uses of sh-t.

A girl smuggles cocaine, and later another man spreads it out and offers another to share it. A cigarette is passed around, but never smoked. A smoked cigarette is shown. A man pours alcohol onto a wound and takes a drink for the pain.

The aliens would be very scary for younger viewers, but not adults.

A main character is implied to be beaten as shown in the preview (emotionally intense scene.)