Especially because said changeling could be as "big" as his partner wanted.Odo might not due to him not being as good as shapeshifting as other Changlings but one more skilled could likely create a penis with nerve endings and circular system that would allow them to enjoy the experience like a real solid though any ejaculation would just be apart of them and would at some point need to return and rejoin the Changling. Which sounds like it would be very pleasurable for all concerned to be honest.
