Yes men should buy earrings either for themselves or for someone else.
Lots of men whether gay, straight etc buy and wear earrings and it's okay.
Now, plenty of straight guys wear earrings — either in a single ear of their choice, or in both.
It's totally acceptable for straight guys to wear earrings.
Studs are the most basic earring type and it is likely what you'll receive when you first get pierced.
The defining feature of stud earrings is that they have a straight post which goes through the ear, and a clasp at the back to secure it.
There are two men earring types that do not require getting your ears pierced – magnets and clips, while the number of style options is almost endless.
You can choose anything, from studs and tapers to hoops and dangly mens earring clips.