Hi, this is Petra. In our group of three couples, all of us girls have tried double oral with the guys (sometimes with the third in our pussy), but no one has found it to be at the top of his or her erotic activity chart. Clair has also tried DVP with my husband and Walter, but the mechanics of it didn't go very well. Walter and Clair were able to cum, but hubby didn't while he was in Clair's vagina with Walter.
When doing an MFM threesome or MMFM foursome, we all prefer, are all able to cum, and all feel connected by having the guys in different openings. (During FMF, the guy usually has his dick in one of us and licks the other.) The guys aren't shy about crossing swords or having balls touch, but haven't play with each other and don't seem to be interested in it. For me, I like having the semen of two men in my pussy, but prefer having one guy after the other. It's more straightforward and I can cum both times.