The main reason people use asterisks in a text is to censor a word, for example: "I like deep-fried sandwiches so my friends call me the C*** of Monte Cristo. Meaning: You're afraid the person isn't as cool as you. Warning: Computer programming joke ahead. Either way, they're looking at the current romantic situation very, very logically.
In my experience, no one uses the left and right braces unless they're a math guy or computer programmer. Meaning: You're approaching this too logically. And that effort hints that you'd be a real hard-working giver in a relationship - or at least into one extremely memorable sexual escapade.
I like to think it sends a subconscious message that you take the extra time to do things right. So when you actually take the time to use an apostrophe, it means something.