1 Corinthians 7:
1: Now concerning the matters about which you wrote. It is well for a man not to touch a woman.
8: To the unmarried and the widows I say that it is well for them to remain single as I do.
29: I mean, brethren, the appointed time has grown very short; from now on, let those who have wives live as though they had none,
Does "should" now imply a commandment to you? Or was there perhaps more to that verse?
If you want to play games with the truth go on without me.
His "attitude" toward sex? The verses you cite are more about his "attitude" about being prepared for the end. It's no different then Christ saying to "hate" your family. It's an admonition against anything that comes between you and Christ using those things which we often take as most important to us (family).