A lot of couples that travel around the world put a lock on a bridge to symbolize their love.
This practise has come so far that one bridge fell because it had more than 700 kg of locks, I think that it is an original way to show your love to your couple but i also think that if you love your partner and your partner loves you this is needless.
In conclusion I think that although it is a romantic idea we shouldn’t do that because if bridges are plagued of locks bridges might be a menace for all of us.