I suppose the question should be "Why should a guy wear perfume?"
Answer: Yes, to smell good. or No, because it is cissy.
Let's call it fragrance (some might call it cologne, deodorizer, or other terms), it all depends on the culture, situation, occasion, and/or whether the bugger has a BO problem. Some apply after-shave to their faces, others to their armpits, genitals, wrists, wherever they feel their female (or male) partner will cosy up to. To sum it up in a nutshell, I believe whether one uses it (or the amount one uses) depends on how far evolved that person has come since his caveman days. The more we evolve, the less we wish to smell like a human.
Cheers!