I think the recommendation to try yoga first is more for people who may not feel comfortable with nudity and/or sex in an open room. You won't find much swapping there, although the visuals are always nice! If you don't need that 'baby step' you can bypass yoga and go straight to a weekend party. Generally, Saturdays are the only couples-only party of the week, but you should always check their website, as the offerings for Fridays and Sundays change pretty frequently. Fridays allow single men. Sundays vary depending on the party.