Since mukhang seryoso si ts sa tanong nya, let's answer that question with seriousness haha.
Step 1: Assess your target. Idk your preference but in my case, they are girls. Every girls are unique. May mga liberated, may reserved, may go with flow lang, etc. Dapat alam mo yung target. This will be your baseline kung anong gagawin mo sa step 2.
Step 2: The right approach. Ang right approach ay oozing with self confidence but not pushy. Set the mood up first. Flirt with her(take note, you will need an ample amout of time on setting the mood to the point na sexually comfortable sya sayo, at case to case basis to). Dapat confident ka rin sa sarili mo. Yung tipong masasabi mo sa kanya with a straight face "I find you really hot right now, will you be mine tonight?"
3rd step: State your purpose. Pang fwb/fubu ba or keeper for good? Kailangan maliwanag ang lahat(Trust me on this, hitting your friend can be shitty as hell. Take note of the word "expectations"). In my case, I directly asked my friend kung ok lang ba sa kanya ang fwb setup, and luckily, pumayag sya.