This is not a question of okay or not okay, it just is. As human beings, we are sexually aroused by any number of stimuli for any number of reasons. As long as it does not lead to innapropriate behavior such as stealing someone else's underwear, excessive obsession and/or hoarding behavior, or becoming engaged in pornography on the internet or in magazines, just let it go. Feelings of arousal are natural; everyone experiences them for unexpected reasons from time-to-time.
If you become concerned about your feelings, or are engaging in any inappropriate behavior, talk to a counselor or therapist.
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Yes, it is normal for individuals to feel arousal in response to various stimuli, including men's underwear. Sexual arousal is a personal and natural reaction that can be influenced by a wide range of factors, and there is no "right" or "wrong" way to experience it. It's important to remember that everyone's preferences and turn-ons are unique and valid.