Soylent to food is what a blow-up doll is to sex.
Your analogy actually seems more plausible to me than gjm's. With a blowup doll and with Soylent, you get a less pleasurable version of the action (sex and eating), while also fulfilling your needs/impulses. People feel more of a "need" to have sex than they feel a "need" to procreate.
Even if gjm's was better, I've never seen someone receive 5 downvotes for an analogy that they think isn't quite as good as another, so it seems more likely that you've been downvoted because people who like Soylent didn't like you talking mean about it.
Previous Open Thread
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.