That’s like saying eating is a sin just becasue there are gluttons, lol
Sex is a beautiful and wonderful act of love and procreation as long as one does it within a marriage, without condoms. Sex was meant to be natural. God intended it to always be natural. Using unatural substances WOULD be a sin.
However, as long as you do it right, God always itnended for you to do it, and sicne it coems from God, it is a beautiful thing indeed.