my hope is to foster a better understanding of biblical truths.
IN relation to the Law (all Scripture is from the NASB)
Gal 3:10 For as many as are of the works of the Law are under a curse; for it is written, "CURSED IS EVERYONE WHO DOES NOT ABIDE BY ALL THINGS WRITTEN IN THE BOOK OF THE LAW, TO PERFORM THEM."
Gal 5:1 It was for freedom that Christ set us free; therefore keep standing firm and do not be subject again to a yoke of slavery.
As to the issue of sex....do an in-depth study of Song of Solomon. I suggest finding a resource that helps you understand Jewish poetry and imagery. The idea that sex is purely for having kids is unreasonable and unbiblical. Of all the reasons God gave us sex He devoted a whole book to sex for pleasure, as opposed to the other reasons receiving passing thoughts in tidbits here and there. That alone should tell us something.
Just a note: I agree with you. I sometimes point out that the point of sex is to have kids, but not to that crazy idea as some take it. (That people should not enjoy it or something, or that using birth control is sinful.)
(Just as the point of union of man and woman is to 'produce godly offspring'. Some have clearly taken this and warped it into some unnatural, by doing such things as banning the use of condoms or birth control.)
OP:
On the unclean law:
We are clean under Christ, so that is that. Many bodily functions are ugly, if one thinks about it, or puts it that way. OTOH, it is amazing the body can digest food, gain power to move our complex body with, and then discharge remnants of it. Farting, for instance, some feel very ashamed about, but as a great psychologist once pointed out... it is actually an amazing physical function that that part of the body has the capability to effectively separate solid material, liquids, and gas to actually expel the gas.
On the guy who pulled out... I agree with this poster. It wasn't that he pulled out that was the sin.
Masturbation is very common, if God wanted to declare it bad, He very well could have directly. He did not.