Oh. Is this where all the "if you didn't have a hand kink before Star Trek, you have one now / Vulcan hand porn / NSFV" jokes originated from (no offense to Sarek and Amanda's open flirting during Journey to Babel but that's hardly erotic given how those scenes were set, context matters, etc.)
Also. They were really skirting around finger sucking here, huh. On general audience television. In 1968. God bless.