Why does this still turn me on?

Sam doing a summer job at the local health spa did his best not to watch.

He did his best not to let his new emotions take over.

He did his best to ignore the growing moistness between his legs.

He did his best not to strip off his little work outfit there and then and join them in the sauna.

He did his best to remember that he was in his sister's body and he was supposed to do nothing to embarrass her as she still believed the great shift one day could be reversed even though he did not.