A page three girl is a female who models for topless or nude photographs that are printed in newspapers (specifically page 3 of the Britishtabloids). Introduced in 1970 by The Sun, the format has been widely copied.
... "they are in me".
"-aham" (I) in the second line is nominative. na caaham =
"...and not I....", meaning "but I am not...".
"teshv-" (in/at/by them) at th ...