Talk:Incubus/@comment-45424649-20200822100512/@comment-10429980-20200822175438

It definitely doesn't reflect the physical strength of your wife, at least not as a rule. You can see this from the scene in World Guide 3 where a baphomet is talking to her lover, a scholar who is pretty unremarkable in most ways (he's not stated to be an incubus, but it's hard to imagine a man married to a baphomet would take long to change). She readily states he is far weaker than her both in magic and physical strength.

Physical changes that do happen depending on the wife are things related to the environment they prefer to live in. Incubi married to aquatic monsters can breathe underwater, incubi with nocturnal/underground-dwelling monsters can see better in the dark, incubi married to monsters that dwell in very hot or cold conditions can handle those extremes better, etc.

In general though, many incubi only notice that they "feel" better overall, that they have more energy, etc. and will say they can't say for sure when exactly they became an incubus.

Radical/sudden physical changes are to things that inhibit sex, such as excess fat or old age fraility. However, one would assume that the, ahem, active, lifestyle of an incubus would cause them to gradually lose weight in general too even if their level of chubbiness didn't inhibit sex. Sex burns a lot of calories after all.