Every motorcycle I have ever seen ... which is far short of all the motorcycles in the world ... has a fork lock. Many upper end motorcycles have a security system as an option. There are also after market systems which can be installed. There is also the "big strong chain and pad lock" method where you carry a big chain with a big pad lock and lock your bike to a telephone pole when you are not on it. While this is pretty good insurance ... I doubt your insurance company will recognize this method of security for a discount.

I hope this answers your question.