The problem here is that "sinful things" is a subjective term. Meaning: By Gods standards Most companies Support sinful things, one big one is, the Love for money. This is the primary reason most companies exist. If he wanted us to boycott all companies with less than holy aspirations then we wouldn't spend money on anything.
If your asking should you buy inappropriate content, the answer is no. inappropriate content is like a drug, one or two hit's will never be enough, and before you know it what worked in the past, doesn't work now, so you have to get deeper and deeper into inappropriate content to get the same effect...
This will effect you and your ablity to properly love your wife in a wholesome way. If your 14 or 15 now and don't get married till your 25 It'll be like you have 10 year experience on her (If she does what she is supposed to do) Because of this once you get over the whole new wife thing, you won't be happy with what she has to offer, because you have been made callous (In you heart) by your choices as a young man. I'm not saying your marriage is doomed to fail, but you are defiantly going into a situation with two strikes against you. And working thru the first couple years of marriage is tough enough, without having bedroom troubles.
As far as spending your money, try and not spend money on anything that will hurt you or others, you can't always do this, but you can make the effort.