lust, desire and love is inseparable in my point of view...
lust is a initial physical attraction to another person while love is not a immediate feeling..it grows overtime and it is something you need to be nurture all the time...if a person is physically attracted to another they tend to be more interested of knowing them (unconsiously) and results of spending more time with them...and the more they spend time the more the feeling gets intense and more deeper other than lust...
as what other married friends saying...always makes yourself to look good in your partners eyes, mesmerize them so they wont look around...anyway just sharing my thoughts
