The Boyfriend Experiment by Sean Ashcroft

“Are you saying space made you gay?”

Having just gotten back from his first trip to space, Gabriel Vaughn finds himself a changed man. Aside from the existential crisis of having achieved his wildest dreams at twenty-six and all the pain he’s in from muscle loss, there’s also the fact that his new, male physical therapist is really, really hot.
The thing is, Gabriel isn’t gay. Or at least… aside from one or two…
Or ten…
Stupid teenage crushes, he’s never been attracted to a man before.
Not that he’s been willing to admit, anyway.
But Reid is different, and kind, and smart, and he makes Gabriel feel safe and comfortable in a way no one else ever has. And he’s really hot.

And he’s willing to let Gabriel run an experiment or two. In bed.
Discovering his true sexuality is an adventure that makes going to space look like a walk in the park, and Gabriel soon realises that there’s more to being gay—and out—than sex.
When a minor incident leaves him running for the hills, Gabriel finds himself with a choice: he can have Reid, the man he’s quickly falling in love with, or he can have the relative safety of staying in the closet and never telling anyone else how he really feels.
Can he find the courage to choose love over fear?