OK, since you seem to have some difficulty with this, I'll go through literally every thing you need to click. There's pretty much only 1 option that's possibly confusing, but they're all pretty damn obvious between the 2 options most choices give.
1: Start the game.
2: Click New Game.
3: Click Yes
4: Click Play From Start
5: Make any changes in the character creation menu, then click the right arrow on the left.
6: Click I'm a girl!?!
7: Click I suppose so
8: Name choice doesn't matter
9: Click It's good to see you
10: Click A new sister
11: Click Yeah, let's get me out of this hospital gown (This is the only one I consider as mildly confusing for the options between the ok / excited)
12: Click Let's, both of us?
13: Click Yeah, I think alone is better
14: Click She's me, what else is there
15: Select the thong (right most option)
16: Click What's wrong with thongs
17: You now have the thong and are given a dress to wear.
If you follow that, you get the thong and are able to get the beach sex scene without buying the specific bikini yourself. This scene was the entire point of what I wrote that post for, since a lot of people were having issues getting it, so having the thing about the dress wasn't something that mattered, since I wasn't writing a full in depth guide for everything ,just getting to that one scene.
