What’s not okay is, for men especially, to be effeminate. St. Thomas Aquinas defines effeminacy as being an inability to separate one’s self from pleasure in order to pursue something arduous. In our culture, this inability is absolutely rampant.
It’s not bad to have pleasure or even to desire it. The problem occurs when we have a disordered attachment to pleasure. A man who can enjoy something without necessarily caring if he didn’t have it is in a good position. But our problem is that most of us will turn into a three year old having a fit the moment we have to do something that causes us to suffer and is not utterly pleasurable, easy, or completely comfortable. Think about that the next time you’re driving in traffic.
Using your example of a car: many people desire nice cars because, ultimately, they’re effeminate. The pleasure of being respected or of having enjoyment is so strong that they can’t separate themselves from it. They feel a compulsion towards it. They can’t do something as “arduous” as having a plain car, because the pleasure they get from a nice car is too strong, and they can’t resist pleasure.
But if *they *were strong and not effeminate, yes, they might desire a nice car and be able to enjoy it. But there isn’t a compulsion towards it, and neither do they particularly care if they acquire such a car or if they have to settle for something more plain and inexpensive. The same goes for food. They can say no and mean it. If they have to deal with being hungry or of resisting a temptation to eat three pounds of chocolate, they man up and do that.
The issue here is that they lack a certain vice, and they’re able to exist in a lack of comfort because they haven’t been entertaining themselves to death since childhood.