Do squids have one larger tentacle to attract a mate?
It may not be used to attract a mate, but male squids do have one tentacle which also serves as a sexual appendage.
Mostly to attract a mate, apparently. They flash in a specific sequence to attract the right species of mate. However, some species attract other species by flashing 'their' code. Then when a potential mate arrives, they eat 'm. Woah. That's awesome! Look at one upclose, cover it with your hands, and it may flash. It's beautiful.