Is the diva cup method just as good as sex when it comes to inseminating?

So my husband has delayed ejaculation which means it takes him a while to climax.. he can have sex for 30-45 minutes before he climaxes.. he has an erection the full time so when sex is for fun great.. for TTC its exhausting.. so our fertility doctor suggested the diva cup/ menstrual cup method of him putting a sample into that and me inserting that up to my cervix and sleep with it in and possibly having a few orgasms to promote the sperm journey to the fallopian tubes.. but he never gave us the data on if this method is just as good as sex or not as good as sex or better than sex...

Does anyone have any insight? Thanks!!!

((TTC 9 months now))

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