Do i need passive voice here?

[bbmak]

1. The more they watch The South Park TV show, the more sexual activities they will involve.

2. The more they watch The South Park TV show, the more sexual activities they will be involve.

I think i need passive voice here, but not really sure

[Mister Micawber]

.
If you want a similar structure, yes:

The more they watch The South Park TV show, the more sexual activities they will be involved in/with.

--but not necessarily:

The more they watch The South Park TV show, the more they will involve themselves in/with sexual activities.
.

[bbmak]

.
If you want a similar structure, yes:

The more they watch The South Park TV show, the more sexual activities they will be involved in/with.

--but not necessarily:

The more they watch The South Park TV show, the more they will involve themselves in/with sexual activities.
.


Wow thank you so much, you example is very clear. By putting 'themsevles' there, you make an active voice