But the clear admonition of Scripture forbids such activity. And the underlying point is that sex is not intrinsically evil. The one who is engaged in such activity is taking what is good and misusing it for evil. So evil does not reside in sex, rock music, television, etc. Types of entertainment are conduits for good or evil.
People are evil.
People who provide entertainment and people who use it can abuse it. A basic premise of theology is that man has a sin nature. We are prone to abuse all things. So the Christian is free to make entertainment a part of his life with an understanding that evil resides in people, not forms. But caution and discernment must be applied.