Parents Guide for
Arena (1989) More at IMDbPro »

An implied sex scene. A woman's butt and the side of her breast is seen afterwards. The characters are in bed together.

Not much violence; mostly kickboxing/punching stuff without much blood (just minor trickles). There are a few fist fights between characters outside of the ring as well.

The back of one {alien} character's head explodes; mostly sparks but some blood is seen. This doesn't happen because someone beat him up, he does it to himself by "accident"

Very little, mostly just minor insults.

One of the boxer's uses a big syringe to "juice up" and get strong. Another character is drugged via some wine he drinks. Some characters smoke

Nothing very intense at all really. Aside from the sex scene mentioned above, this is suitable for family viewing. Some of the alien designs might scare younger kids, just because they're weird.