Posting about it on FB is weird, yeah.
BUT, being into it is fairly standard I would have thought, at least at a low level. Being tied up with a silk scarf, or held down, or blindfolded, a bit of biting, pinching and light spanking is on the same level as maybe anal sex or using toys together or dressing up in fancy underwear - not the absolute normal day to day, but also not anything to raise an eyebrow at. Lower level on my imaginary pervy scale (that I have just this minute invented) than, say, a threesome or dressing up as a sexy nurse or something.
I'd say level one is stuff that it is unusual not to be into... PIV (obviously in a straight couple, a same sex couple would be different in various bits), oral sex, kissing, masturbation etc.
Level two is stuff that is fairly normal to be into but also not odd to not be into... this includes said mild bdsm style stuff etc
Level three is stuff that is more unusual - full on roleplay, threesomes, actual hitting with implements, strap ons, etc
Level four is the more specialist stuff - more full on BDSM, swinging, anything that requires special equipment beyond the normal Ann Summers stock, etc
Level five is the proper weird stuff, very specific fetishes, the stuff that you have to google and that would confuse people who were hearing about it for the first time.
Not that people should b judged one way or another, you are into whatever you are into, obviously. And also you could be into stuff from higher levels but not some of the stuff from lower levels. And I have only just made up this scale so it might not make sense, bt you get my jist anyway...