What can I do if someone I know was solticing sex and looking for women between the ages of 18-35?
Umm...I'm sure you CAN do lots of things, but why would do anything? As long as the persons involved are all of legal age, soliciting sex isn't a crime (unless you're seeking to charge or pay money for it).
Can I take them to court?
Huh? Aside from you having some sort of evidence, what does this have to do with you? If you think a crime has been committed, feel free to report it to the police.