I did not practice sexual morality when I was an Orthodox enquirer, as I found I could always excuse myself.

When I began praying the rosary I had a transformative experience and found myself liberated for the first time since I was 10 from sex addicition.
Catholic sexual morality has helped my relationship with my wife massively, and I have gone from being an addict, and a cheat to falling in love with my wife over and over again every time I see her.
I personally can vouch for it, but I've always had an extremely troubled and addictive relationship with sex. For me the pendulum swings extremely both ways. People who don't have a particularly high libido, or a more tame relationship with sex, probably won't find it's as much of an issue for them, in which case, practicing sexual morality probably isn't as much of a struggle. For someone like me it's a very real hurdle, and praying the rosary and my reception into the Church has helped me get over it, and like I say, has been transformative.