I had the same poll question inNeo BL Texting Community and here are some of the response that are worth posting:
Stat info is ok. Top or Bottom, ayos lang. receptive naman ako, but I'd
rather answer it with somebody im dating.
Kapag stat lang yung ask, ok lang... Normal pa for me, pero kung top o bottom na, mejo turn off.
Honestly kapag may nagtanong sakin if top or bottom ako, newbie man o hindi, TURN OFF din agad ako. Una ko kasing naiisip na malibog siya.
There's no harm in asking for such info... We prefer to know atleast something abouta person since each of us have our own preferences. Asking those info will lead us to find someone we can jive with o possibly more than we expect.
To ask someone his position in bed is immaterial in making friends. But when it comes to relationship, it is, at least a part of it.