Earlier quoted context omitted.
Of course if you banned contraception, the birth rate would rise. But that's not what we're talking about, is it? We're talking about "private acts between consenting adults." Birth control is another kettle of fish entirely. You're taking the employment/sex "between two consenting adults" line and then adding an extreme element, like, for example, everybody on earth is required to work 40 hours a week.
Even if you didn't ban contraception, I'm sure birth rates would rise -- because people who wanted to get off and couldn't get fellatio might still not use contraception all the time. > We're talking about "private acts between consenting adults." Birth control is another kettle of fish entirely. WTF?
The OP was arguing that people are hypocrits, if they say "two consenting adults can do whatever they want" (behind closed doors) for sex, and then turns around and wants worker protection laws.
Nobody in this comment thread is actually talking about sex. It's all about the metaphorical comparison, which IMO, breaks down pretty quickly.
In the metaphor -- two sex vs unpaid internships -- there is no corollary for birth control. It is a red herring.
Get it?