Changing condoms is safe and yes it does show she cares and is being careful. Two condoms one on top of the other, is not good and can have the reverse effect and split the condoms due to friction.
I change condoms when going from oral to sex. To ensure no nicks from oral :-)
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Cassandra (24-07-15)
I literally can't come with a condom on. Actually just can't. That's why I've never visited an escort before. And a (small) part of the reason I want an escort who is a dominatrix. Insertion not required
It just hurts me and cuts off blood flow and isn't much fun. Maybe it's a circumcised thing, but aside from pain there's no feeling for me with one.
Men from kerry always use two condoms just to be sure to be sure :-D