Don't hint-they just won't get it. They are just general guides. Although there are some great benefits to online dating websites, always practice caution and safety when planning to meet someone in person. In other words, many teens with autism feel the physical desire for sexuality before they have the social competence for successful dating. For example, if it is difficult to distinguish between making a harmless, flirty joke and making a hurtful or offensive joke, try another strategy to show interest, like asking about things the person is interested in or even volunteering to help the person with a project.
They may just express it differently. Make plans for an activity of mutual interest. I had to come home from Wales to Essex because I was so distraught. No one will ever be perfect at it, but practicing social skills and learning the hidden curriculum are good places to start.