i am not the casual person, but casually gets up is not the person
I am not a loose person, but once out of control, I would behave badly.
老外根本就不会说这种涵义大过天，含蓄深过井的话。
depending
on
the
specific
scenario,
you
may
say
1.
i'm
serious
about
relationship
or
2.
i
hate
casual
sex
or
3.
i
find
no
excitement
in
flirting
（ps.千万不要说成自己不是人，或者什么很松很紧之类）
I'm not easy, when I am easy I'm not human.
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