you'd be surprised what guys like that are open to, even for their first time! actually i think they might be more open BECAUSE they're new... don't know what they like yet, want to be directed, etc... (for the record i'm not talking out my ass, i'm married and have been with numerous guys like this) but i do understand writing what you know, of course. writing sex scenes is hard, even when writing a scene you've basically already lived irl!