Not Another Hero by Wendy Rathbone

When porn stars make sexy movies in space, no matter what happens, don’t fall in love!
To help finance expensive voyages, space exploration has become a scripted, triple X soap opera. Trips are fully automated, controlled from Earth. The crew are not scientists but porn stars called Heroes. It’s fun and lucrative, until someone tampers with the script.
Meanwhile, the playboy captain, Stirling Kane, who lives only for filmed hook-ups to bring in the royalties, finds himself falling in love with a new crew member who might not be a real porn star Hero, but an imposter. Worse, he might be an actual scientist!