From the Rabbanu Yona, Brachos 17a Dafei HaRif:
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http://www.hebrewbooks.org/pdfpager.aspx?req=37952&st=&pgnum=356
He says the same regarding Tefech, that it is Muttar to read Kriyas Shema as long as there is no Histaklus to the Ervah. At the very least, it makes one wonder.
(I hate to interject in this argument of lamdanim. I just know a Rishon (and unfortunately, am not much of a Lamdan)).