Ah! I see know... Well now I know! and I'm glad to say; I've been a tower! Although it's been quite some time since my tower days...
I don't really know of another name besides sandwich... Been the bread for one of those too! Also simulated the double penetration with a dildo... did it double vaginal quite a few times and even double anal once! After her orgasm my lover went numb for a few minutes....