Yes, boys do sometimes look at girls' lips. This can have several interpretations, depending on context and other nonverbal cues.
Potential Interpretations of Lip-Gazing
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Romantic Interest: Looking at someone's lips is often cited as a strong indicator of romantic interest. Several sources indicate that this is a common body language cue suggesting a desire to kiss. [This is supported by multiple Quora and Reddit threads](https://www.quora.com/Why-do-guys-look-at-girls-lips-when-they-talk, https://www.reddit.com/r/AskMen/comments/l68qw8/men_how_common_is_it_for_you_to_glance_at_lips/, https://www.reddit.com/r/dating_advice/comments/yivsaj/what_does_it_mean_when_a_guy_looks_at_your_lips/). One source even claims it's a "major sign" of wanting to kiss someone, citing psychology.
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Comfort and Attraction: Lip gazing can also indicate that the boy feels comfortable talking to the girl and is physically attracted to her. This is an additional interpretation from multiple sources which suggests this act could be influenced by a multitude of factors.
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Focus and Concentration: In some cases, a boy may look at a girl's lips simply as a way to focus during conversation. This is noted in a Reddit comment suggesting lip-gazing can assist concentration during conversation. This is independent of romantic attraction and may be a subconscious behavior.
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Observation: It's important to acknowledge that people sometimes simply observe other people's facial features without a specific meaning behind it. The interpretation heavily depends on other accompanying behaviors.
It's crucial to consider the entire context when interpreting someone's gaze. A single glance at someone's lips doesn't automatically mean romantic interest. Additional cues like prolonged eye contact, smiling, body language, and the overall dynamic of the interaction are important factors in determining the intent behind the gaze.