This is the only part of the sentence on which we need to focus.
________________ approach to seduction
than any
surfeit of charisma or skillfulness.
So according to the author "Don Juan" did not have excessive charisma or skillfulness, which made popular with women.
Now going over the options (all adjectives describing his approach)
sumptuous ...... splendid
lurid ...... bright in colour (negative adjective)
covert ....... secret
indiscriminate
blanket
sybaritic ...... sensuous
One could be tempted to use lurid and sumptuous, but lurid is a negative adjective. However if you have use indiscriminate or blanket then the sentence conveys the meaning that Don Juan had a very generic approach to seduction.
PS: This is the fabled
Don Juan