Well, a lot of things that people RP could be ridiculous to someone else.

As for overtly romantic/sexual rps, it depends on what you're talking about. RPs where you just cannot see hings happening in any way, shape, or form? Where it makes you tilt your head and ask 'how is that even possible?' If that is what your talking about, sure, it can be ridiculous.

But for others? Well, it's a hard thing to write for a lot of people. I agree with @Vilageidiotx - you have to start somewhere when learning how to write it. If you want to subtly build up a romance, sometimes you can't do that without knowing what the extreme is. *shrug*