The phrase "bare hard on" is a slang term used to describe a physical response in males. However, there are plenty of more appropriate and professional synonyms that can be used in its place. For example, "erection" is a medically accurate term that describes the physical phenomenon. Other options include "stiffening," "enlargement," and "tumescence." Additionally, phrases like "getting aroused" or "becoming sexually excited" are more appropriate and respectful ways to describe the same concept. It's important to use language that is appropriate for the situation and respectful of all parties involved.