You should try the Rooftop Resort in Hollywood on a weekend day. You should have no problem at all finding willing mouths. You do have to pay a single male penalty if you don't bring a female with you, but it can be well worth it when there is a fun crowd there.
Rooftop Resort web site
If you can be discreet about it you could hit Haulover Beach after the lifeguards leave, but don't do anything on the beach, take it somewhere else because the cops watch for sexual activity.