While it's not a requirement, it is not uncommon for yacht crew members to sleep with guests. There are a few reasons why this might happen:
-The guest is wealthy and can offer financial compensation for sex.
-The guest is attractive and the crew member wants to have sex with them.
-The guest is lonely and feels more comfortable talking to and sleeping with someone on the crew than they do with other guests.
-The guest is looking for drugs or alcohol and knows that the crew member can provide them.
-The guest has been flirting with the crew member and the feeling is mutual.
Of course, there are also plenty of reasons why yacht crew members would choose not to sleep with guests, including personal preferences, moral values, or professional boundaries. Ultimately, it's up to each individual to decide whether or not they want to engage in sexual activity with guests on board the yacht.