Are there any adulterers, fornicators, masturbaters, porn watchers etc that are Baha'is? Probably. But probably they keep their sexual behavior a secret. So is homosexuality done in private, okay? That way they can live their Baha'i life as if they are "normal". And keep their "forbidden" behavior secret.
Our private lives are between us and God. We all have shortcomings so if we banished everyone who wasn’t perfect there would be no Baha’is.