clothing-optional saunas in UK/AU/NZ that work for BiM curious types... looking for honest recs, not promo. partner wants somewhere relaxed, mixed couples and singles, not a hard cruise vibe but not a families-with-kids spa either. we've tried a couple in london that were either too sexual too fast or weirdly sterile. heard good things about a few places near auckland and one in the lake district but every site is so vague. for the bi-curious husband who wants to be in a clothing-optional space without it being a meat market, where actually delivers... and is there a midweek vs weekend pattern worth knowing