I would say A Little Piece Of Heaven by Avenged Sevenfold LOL but it's a bit... not love songy at the same time? Oh boy. Halestorm has a few as well. And Sick Puppies I think. My memory is crap right now oh wow.
Well the thread description also asks for 'punk' so I would recommend Beauty Sleep or I Am Yours both by, The Adicts; Though they more lean towards New Wave so I'm not sure if they're quite what you want.
I guess you could say The Rock Show by Blink 182 is kind of a love song but possibly not what you're looking for. Kids In Love by Mayday Parade is a good song but it's not really punk or anything. I think there's a lot of songs above love and stuff by Bon Jovi too. Bulletproof Love By Pierce The Veil is a great songs but I think it's more about being in love and then breaking up. I can't really think of anything at the moment but I listen to a lot of that type of music and I know there are good songs. :S