1. Being willing to "do anything" to get a date with someone.
2. Fighting a potential romantic rival.
3. Completely changing your entire look to meet the desires and expectations of the person you want to date.
4. Having a quirky origin story about how your relationship was based ON A BET.
5. Kissing in the rain.
"Well it's fucking freezing, I've wrecked my new shoes, and I don't see why we couldn't have just done this inside my perfectly good house where it isn't raining."
6. Sharing food and feeding each other in restaurants.
7. Anything sexy involving pouring honey/chocolate sauce all over yourself.
8. Filling a room with gratuitous sex candles.
9. Showering together.
Another thing that's awesome in theory, but unless you have an enormous shower with two heads someone is going to be standing getting cold 50% of the time. And if you've got a tiny cubicle shower how the fuck are you meant to move around?
10. Having a bath together
11. Pool sex.
12. And hot tub sex.
13. Grand romantic gestures in front of large numbers of people.
14. Complete surprise proposals in public.
15. Turning up at your partner's workplace to confess your love.
16. Running after someone at the airport to stop them getting on a plane.
If you try and run past security you're probably going to be a on the No Fly List for the rest of your life. And they're NEVER going to get a refund on that ticket at the last minute.