Well in some cases Monsieur Damion.

These sexual vampires in question, feed through sex. This does not mean that they feed while having sex; rather sex is the feeding. Sexual Energy.

Boost of the core which relates to the PSY Vampires, however Sang vampire would probably feed during the act of sex. Just like a politician feeds during a congress meeting. It's mostly bullshit in that phase. Good luck on finding your answers.

~OMEN

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For everyman unto thee, hath a reason to be. For if not surely the mortal soul would die inside.