Deriving from your own explanation in the OP, the natural choice would be amicular.
I do not seem to find any dictionary entries. Need to see why.
Preliminary:
Book Doctor Gwen : 92 Feminine and Masculine Word Pairs
Feminine term / Masculine term /// neutral or inclusive term
4. amicular* / avuncular
(*Terms that are slang or recently coined.)
Contemporary Pragmatism - Google Books Result
books.google.com/books?isbn=9042018445...
John R. Shook, Paulo Ghiraldelli - 2004 - Philosophy - 200 pages
... be offered as amicular advice to discourse generation researchers, along the lines of the earlier 'Don't ask for the meaning; ask for the use', ...
Mate/pal work just fine for ladies as long as they actually are your friend: best of mates, we're just mates, pals together and so on, but, mate/pal doesn't work as well as it does with men when the woman you are apologising to is unknown to you.
In my opinion, the safest Sorry (for a man) to say to a woman is just plain Sorry.
The following terms are UK based.
If you want to take a little risk then you could try
Sorry Miss for a youngish lady or Sorry Madam for an older one but that seems quite stuffy and Madam might not always be well received.
I don't think Sorry Missus is very popular unless said by children.
All the phrases below are also used by women when talking to women or men (friend or stranger).
Sorry love is generally acceptable in most of the UK.
Sorry dear should perhaps be reserved for ladies older than yourself these days, but then if they don't think they are old ...
Sorry darling might well get you some grief unless the lady is your wife, girlfriend or a friend although it was (and probably still is) commonly used in the South.
Sorry pet seems reasonably acceptable in Northern England along with Sorry lass if the lady is younger than you.
Sorry hen in Scotland seems to cause offence as often as it doesn't.
This probably applies equally to Excuse Me: when you want to interrupt someone to ask them a question Excuse me mate works fine when you are asking a man, just plain Excuse me when you are asking a woman.
Best Answer
I'm going to keep it simple and say sexual conquests.
This terminology while not as flowery conveys the exact sense of what you mean.
If you really want it to be lesbian and flowery, then try sapphic.
Sapphic refers to the Greek poet Sappho born on the isle of Lesbos. The term has come to be synonymous with lesbian sexuality.
I think the priapic concept is lost when describing the sexuality of women because of the lack of necessity for an erection for sexual activity.