Well, after using Insteads for 10 years, and knowing you can have sex w/ them, I was having a difficult time accepting not using them, if only for this purpose. I still have them on hand, if nothing more than to pass out to newbies to cups. I've read about "sea pearls" extensively, and have had them on hand for years to apply makeup instead of the sponges you get in the stores. I'd previously (years back) used sponges temporarily for my cycle, but leaked so much (yeah, like I thought they'd absorb foreeeever?). Being older and wiser, I keep them around. If you're using them during your cycle, your spouse will not even feel them. They act as a barrier between the bleeding cervix and his parts entering you. If you know ahead of time, simply wash/rinse your sponge before you become intimate. It will do a FINE job keeping things unmessy during intimacy. When you're "done", take it out and wash/rinse again.
I was cramping so bad yesterday, because I was 12 days late on my period. I felt like I was having labor pains, honestly. I even took my Diva cup out and put a sponge in. I hated having to get up 3X to rinse out my sponge, but at least I could have a complete awareness of my cervix cramping. I thought Diva was rubbing it, and it was just realllllllllllllllllly bad cramps. Cup is back in today, and sponge is out, but it was nice to have the option.
Also, the sponge just saw my daughter through her first yeast infection. I found info on the net about home remedies for YI's, and how the sponge helps to treat them. If she'd have followed my directions completely, we wouldn't have had to resort to Monistat! URG!
Anyway, sponges are great for intercourse, and comfortable (can't feel them). When you're "done", just bear down, and fish for a pinch of sponge. You can also tie some dental floss (natural, unwaxed or waxed) to the sponge, if you need a "string". Hope you find this helpful info!