About Leadbolt...

Do (adult) porn surveys have good earnings?

Do they have a high conversion rate?

Can you use one page script for every single page you want to put leadbolt content locker on?

Should I stick to surveys like

"Whos Spying On You"

"What Fast Food Do You Like"

Or..

"Do You Want To Get Laid Tonight"

"Find Out Whos in Your Area"

Which types of surveys make more earnings/conversion rates?

I'm not sure if you know what you're asking here. There are like 100 variables that need to be taken into consideration when trying to answer something like "Which types of surveys make more earnings/conversion rates?".
The ONLY way to know for sure is to test it yourself. We don't know where you get your traffic from, which offers they like, what are you using for "bait", etc.
I'm certain that no one will be able to answer your very broad question precisely...