Flex

/flɛks/ (noun)Derived from English "Flexible". A homosexual slang mostly used in Malaysia

In male homosexual anal sex, a person who is comfortable, willing or enjoys being the receptive party (bottom) and/or the penetrative party (top). His exact role is not well determined and often times changes in order to complement or satisfy the other party or parties sexual desires. The flexibility of a person changing his sexual role according to the needs of his sexual partner or partners is where the term "flex" came from.

In other parts of the world, a more familiar term is "vers".

Here is what a typical Grindr conversation in Malaysia in its original text may look like:

BigDick7in: hi fun?
LastDay: t/b
BigDick7in: t
LastDay: sorry, I t too
BigDick7in: y u write flex? cibai!
BLOCKED

(DISCLAIMER: The English text shall be view as an approximate translation. Its accuracy is not guaranteed and shall not be used as reference in situations where absolute translation is required. It is done with speculation and may not reflect the true intentions of the users.)

BigDick7in: Good evening. I wonder if you are interested in having casual sexual intercourse with me?
LastDay: Before we proceed, would you care to share with me your preferred sexual role?
BigDick7in: Of course. As you may have already noticed my crass but yet frank handle, I enjoy having a bottom riding my stick.

LastDay: Thank you for clarifying. Unfortunately, I am not compatible as I cannot see myself being your sexual partner.

BigDick7in: Regrettably, I find the basis for your rejection hurtful and unreasonable, even though it's the same reason for me engaging you initially, albeit it's your positive sexual attractiveness. I resentfully advise you to not mislead people with your stated sexual role. I curse you that in lieu of a penis, a vagina is what you shall have!