I do not believe that abstinence from sex is worthless. If I did, I would not have abstained from sexual activity for 24 years of my life.
I do not affirm that we must freely have meaningless sex all of the time. If I did, I would have done it, and I have not.
I believe that sex is a sacred gift from God, and it must be taken very seriously, and never thrown around.
That is all.