Just don't stop bringing them together. Although they will argue the first few times, or sometimes the first lot of times, eventually they'll kiss and go off to try for a baby. If that attempt is unsuccessful wait about fifteen minutes then try again. Then again if necessary ... I've used Baby Boost a couple of times only, but in general they've not needed it.
I went back to one of my four reluctant females to try it your way. The first thing that greeted me was a response letter addressed to "Margaret" from the adoption agency. I smiled and thought, fate or coincident? (See letter below)
I'm sure my female "Happi" didn't wish for a similar letter. After arguing a couple of times she produced a set of healthy twin boys. Both hubby and I are very grateful to Bill and Arnie!