The roman catholic church has rules and nobody is forced to follow those rules. If some people like to think they are roman catholics then they should follow those rules which include not having sex unless you are procreating.
Now you can say the church should evolve, become modern, and while that would be fair, it's also fair for the church to stand by their ideals.
You can insist and say they have a fair share of responsability for those who follow them which should make them evolve faster but people need to start thinking for themselves and think about what's more important: being roman catholic or using a condom?
I'd say there's only one way you comply to both: if you're married to someone HIV positive and want to procreate. If that's the case, you might want to think about your child which might carry HIV too.
edit: At the end of my post I said "your child which will probably carry HIV" but apparently it's not a high probability as pointed by sounddust so I changed it to "might carry". Thanks, sounddust!