Buffy and Spike get tossed back to the Victorian period and Buffy does not take it well. She's immediately labelled "hysterical" and pitched into an institution.

Spike has to pose as her husband to get her out, but before the doctor lets him discharge her, he sits them both down and impresses upon them the need for Buffy to have multiple orgasms for the sake of her constitution.

The doctor may even ask for proof that Spike is up to the task. You know those people had no boundaries when it came to these things.