80's glam metal is probably your best bet for this, so I'd recommend (even though some of these are about break-ups, they are still 'love songs'):
-Every Rose has its thorn, Poison.
-All she Wrote, Firehouse (hell, basically anything by Firehouse).
-Don't know what you got (till it's gone), Cinderella.
-After the Rain, Nelson.
-Alone Again, Dokken.
-Turbo Lover, Judas Priest.
-Livin' on a prayer, Born to be my baby, and I'll be there for you, all by Bon Jovi.
-Is this Love, Whitesnake
-Scorpions, Send me an Angel.
-Heart of Stone, Europe