Advice for new 'single' guy

hi - new to all this. Happily married near 15 years but we have grown sexually incompatible.Ive wanted to step out for a while but my wife is just not interested - although i have permission to go by myself. I really want to get involved in swingers parties or with other couples - but i am playing alone. Many profiles and party sites say 'no single guys need apply'. How can i get to go to these swingers parties by myself? Thanks