An element of forbiddenness and sin! Requires extreme caution! A high degree of trust between partners, because the woman may be very uncomfortable, but she still trusts, allowing you to give her pleasure in an unconventional way. The stimulation is stronger! Anal sex happens when both partners know for sure that they will fuck (unless you are a dirty pervert).
And I agree – vaginal sex is minimally uncomfortable, yet it's a profound expression of love. It should happen earlier, as it can happen with virtually any surge of desire, requiring no additional preparation.
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