There is no wining and dining, movies or hotel expenses. There is no birth control to worry about. There are no sexual transmitted diseases to fear. There are no possibilities of babies to abort, raise or paternity suits. It seems to be a lot more safer to lust.
Every day can bring on a new object to lust after.
You get Playboy or Playgirl each month and the centerfold looks better and better. If February looks better than January then the latter can go in the closet or maybe the trash. There sure is less commitment by lusting. You can get a new object of desire every day if you want. However, God has His reasons for not wanting us to lust.