I think you should look for someone that is not only a mate but your best friend. So when those boobs sag and those balls don't strop dropping you can still laugh and love to be in each other's presence :)

Find someone you are attracted to and that can be your best friend! Everything else will work out!

What also helps is to be comfortable in your own skin and love yourself! If you can love who you are, people can also love who you are! :)