Question:
Personally, I think a great example of a (Mediterranean) summer night is Annick Goutal's Les Nuits d'Hadrien - which was inspired by that theme. It is mellow, citrussy, and most of all sensual.

Answer:
Live JAZZ
CK be

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Millesime Imperial

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Minotaure - Paloma Picasso

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Is it just me, or does L'Homme Sage smell like it would be welcoming on such a night? Imagine meeting the man that smelled sooooo good in the heat of the night! Yikes! I'm turning gay just thinking about it!
- Rich

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different company - jasmine de nuit

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Carnal Flower or stealthily applied Mahora. (I love tuberose on a guy.) Fresh's Hombre de Flores Polianthes Tuberosa is a really nice masculine tuberose with moss and ambergris if Mahora's a bit much for you guys!

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Penhaligon's Endymion

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For me it's Les Nuits d'Hadrien by Annick Goutal. I've started to wear this a bit more since Spring has brought some warmer days.

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For some reason I always associate D&G pour Homme with mid-summer nights.