We have (as a society) made sex common and vulgar instead of having kept it sacred (in the sense of being "kept apart") and intended for a specific context (within the bounds of marriage between a man and a woman). Everything else is excuse - even the idea that it just needs to be "consensual" only implies "as long as you want to do it, do it!". So with the cultural rebellion of the mid-20th century, we saw a shift from maintaining established Christian values that has molded Modern Western Civilization for several hundred years now, to what someone else here has accurately called "moral anarchy". Instead of seeing the value of self-restraint (because the sex drive is certainly powerful), it has been targeted for "liberation" and the result is freedom (read: license) that means it can be had anywhere, anytime and with anyone and no stigma attached (unless you hurt someone's feelings or destroy their family in the process).
I would argue that, in the process, we have lost the concept of true beauty (in the most elevated sense) as well. Now, like with sex, it's "whatever you want...as long as it doesn't hurt someone else". Well, this "freedom" has "hurt" an entire generation (or more). So much for foresight.