The posek of this site,
R' Yehuda Henkin, does allow use of a
diaphragm with spermicide as a contraceptive method. While
hormonal contraception or the
IUD are usually
halachically preferred over barrier methods such as the diaphragm, when there is a need or even simply a desire to avoid those methods, the diaphragm may be used. (If other methods cause staining issues, use of the diaphragm may be preferred to avoid such issues.)
Please feel free to get back to us with any further questions.
B'Hatzlacha!