Well last night we DTD (SMEP not going very well, pretty much BDing every evening) and afterwards used a softcup... It was SO easy and I couldn't feel it at all, just slid in. Left it in overnight and then (TMI coming up) took it out this morning and let's just say it definitely keeps the spermies up there, could see it in the actual cup!
Obviously I don't know if they're gonna work yet, but would reccommend them as they aren't half as scary as they look. I was surprised at how flexible and small they go, will definitely use again as wasn't worrying about everything coming out after going to the toilet/standing up.