You don't have to say "I DON'T THINK YOU'RE SEXY. YOU MAKE ME FLACCID." All you have to do is open up a little bit and express that you're having difficulty getting an erection around him; it's not a problem with him physically—the guy is cute as fuck, so I promise it's not—it probably stems from you being uncomfortable with monogamy.
If both of you are at all mature enough to be in a real relationship, then sitting down and having a benign discussion shouldn't be overwhelmingly difficult. It is possible to work through things like this, so long as you're willing to invest a modicum of effort.
Also, you mention that you used to have frequent, great sex every day with this guy, before becoming officially monogamous; however, I thought you said in the other thread that you tried having sex and he decided he couldn't bottom. Did I misread something? Or was he just topping before? If so, why don't you try doing that again, to revitalize your sexual interest in each other? If not, again, just talk to him. I doubt the relationship will last a very long while if you guys are unable to communicate on such a basic level. : \
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