Was on holiday with my girlfriend many years ago and remember we had been fucking in the morning, in the afternoon after lunch and a few drinks then sometimes at night.
I remember we both were fairly shattered getting into bed one night then we could both hear the couple next door having really noisy headboard banging sex, the woman especially was very vocal. This had an immediate "effect" on my cock and i just rolled over and started fucking my girlfriend who also said it was very horny listening to another woman getting fucked while she was.
Anyone else experienced this ?

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Sex is good.
But nothing beats the build up.