I have never asked when a good time would be to approach her concerning this. The female problems are generally AF and her aftermath. As far as i know, there is nothing that will make her comfortable about this - she just does not like it. and by it, it is not sex - but everything that involves foreplay. foreplay w/ her, moreso then me, but even some things w/ me its a no-no too....
its like deprivation. god, i feel nit picky, but i know i am not...