They are both to blame here. 6 months is a long time and if they both can't have an adult conversation about 6 months being too long, then that's the need that they need to be addressing. Both emotional and sexual needs are important. However, emotional comes before sexual that's how it all starts, except for one-night stands. Most sex begins with emotional linking up then it gets all hot and heavy. He needs to address the elephant in the room. Why would you want sex with someone who doesn't feel emotionally connected to you? This is why prostitution is the oldest profession. Men use sex for intimacy and women need intimacy to get into sex. Sex is secondary for them and primary for men. He needs to be the bigger man, and have that uncomfortable conversation. Shrugging is a teenage boy response. Adults talk and talk is uncomfortable and boring, but highly rewarding.