Firework

I don't think it's necessarily about sex. It's about wanting to start the day with some love and affection. Maybe a warm cuddle. I'm not alone in interpreting it that way! For example: "'Just a Little Lovin’ is a timeless country song originally recorded by Eddy Arnold in 1954. The song, written by Eddie Miller and Jimmy Campbell, explores the delicate nuances of love and showcases Arnold’s emotive vocals. It delves into the universal theme of love and how even the smallest gesture of affection can have a profound impact on our lives." https://oldtimemusic.com/the-meaning-behind-the-song-just-a-little-lovin-by-eddy-arnold/

“Head > Heels” is a track that aims to capture what it feels like to experience romance that exceeds expectations. Ed Sheeran dedicates his album outro to a lover who has blessed him with a unique experience that he seeks to describe through the song’s nuanced lyrics.

Ed Sheeran shares a short story of reconnecting with an old flame on “American Town.” The track is about a holiday Ed Sheeran spends with his countrywoman who resides in America. The two are back together after a long period apart, and get around to enjoying a bunch of fun activities while rekindling the flames of their romance.

I think the meaning is pretty clear. This person got really burned in a previous relationship, and because of this is unable to love and show care in his present one, even though he so badly wants to. It's lovely song, and very sad. You can really feel how defeated and frustrated he is with himself.

In the 1980s, sunglasses were a common fashion for people who wanted to adopt a "tough guy" persona (note all the cop shows from that era -- Simon & Simon, Miami Vice, etc. -- where the lead characters wore shades). So I think this song is about a guy who wears shades as a way of hiding his insecurity after learning that his girlfriend is cheating on him. He's trying to pretend that he's a "tough guy" to hide the fact that his girlfriend's affair is disturbing him.