How does it affect their relationship with each other?

attractive couples always seem more "playful" more lustful , you can feel the sexual tension between them.

as for "ugly" couples" the vibe it totally different , some times it looks like they are just friends that are ashamed of each other a little bit , they wont make out at public places , they are generally more shy , and its understandable ,

because you NEED to be attracted to your partner and love yourself , then communicate it to your attractive partner.

if you feel unattractive , ashamed , and don't love yourself , this is what you will communicate to your partner.

id like to get an insight on relationship and sexuality's wise