But it is 100% possible to masturbate without lusting
I always thought the same thing.
But as for the main question - No. Sex is not "evil" and was never expressed as evil unless it's within fornication or adultery.
Adultery (fornication while married) is the only reason as to why a married couple can divorce.
People may claim that Birth Control is a sin but it isn't. If it were, then there'd be a huge contradiction within the Bible and between God and humanity. If I explain, it'll be a lot of text - but long story short, if non-procreational sex were a sin, then the whole idea of marriage would be like God giving us a defective gift. "It's okay if you stay single, you'll face the same amount of possible troubles that the average single person may face. However, if you marry, there's even More possibility that you'll sin and fall into temptation than those who aren't married." Why would God allow us to give in to marriage if the chances of sinning were greater than those who aren't married? God and Jesus Christ wants us to flee from temptation and try our best not to sin, why would God create marriage if a sin of non-procreational sex were an option? For God is all knowing and perfect, why would he give us the opportunity of a defective gift?
A couple (or a person within the couple) may have selfish reasons as to not having a child yet or at all..but such reasons are rare, and I kind of don't necessarily even count that possibility, as most likely, a successful married couple will eventually decide to have at least one child. Still, the method of Birth Control isn't sinful, but their motive can be.
Of Course, Abortions are sinful. Technically, that shouldn't even be considered "Birth Control", it's murder..we all know that...lol..Some of us are on Birth Control medication that may cause an abortion without us knowing (which I'm not too sure what the possibilities are) so to play it safe, those (like myself) who take such medication because of an illness or so, if you were to marry and not decide to have children yet, use a condom - don't solely rely on the pill.
But overall, sex is not "evil" and it only is if it's within fornication or adultery..or if you're severely hurting..like beating up your wife or husband during the activity..which that'll just be ridiculous..