Well some "services" may sound redundant but knowing how prossies behave the following list (in alphabetical order) catches many of the usual caveats:
100% accurate enjoys list
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Auto-erotics
Being Filmed (with face)
Being Filmed (without face/wearing mask)
COB
Clit stroking
Extraball (cum 2-3 times per hour)
Extraball (cum unlimited)
Fingering (insertion with gloves)
Fingering (insertion without gloves)
Footjob
French Kissing (lips only)
French Kissing (with tongue – sensual)
French Kissing (with tongue – deep)
Kamasutra (different classic positions)
Kamasutra (advanced positions)
Long term arrangements (discounted monthly fee)
Nuru
Private flat/house (non-shared)
Shower together
Titjob
Also it would be good to have a search facility for
(i) “outcall only” girls, i.e. to be able to exclude the girls that provide incalls.
(ii) nationality