Just returned from a RCI cruise, western Caribbean and there were tons of guys wearing mainly trunk or square cut speedo suits, there was also many more guys in brief cut, this could be a great sign that these types of suits are getting more popular and accepted!!

Good to hear that they are becoming more common.

Yes, I have cruised 20+ cruises and had never seen this many square cut, trunk or speedo type swimwear. There were many more non US pax on this cruise, the Allue of the Seas and it has 5,000 pax + crew

Allure of the Seas
 

I'm actually headed out on Allure of the Seas this coming week (Jan 2) and will report back with any info on others in anything less that board shorts (usually the case with RCI cruises).

Like many have said, they are definitely allowed. You won't see a lot of speedos, but you do see some on any 'mainstream' cruise. Sometimes I've been the only guy in speedos, which doesn't bother me at all. Sometimes other guys start wearing them later in the cruise.

Cruise
 

Just got back from my cruise. There were a substantial number of men in brief suits, I would estimate about a quarter. Most seemed to be speaking a language other than English. I mostly wore a speedo solar and didn't feet at all out of place doing so.

Was this a gay oriented cruise?

Probably Europeans who aren't worried about wearing those kinds of suits.

Cruise
 

Cruise was not gay oriented, many retired couples and some retrired singles; some younger couples, singles and families. High percentage of Europeans (especially Germans) and Latin Amercans. I meant that about a quarter of the men were wearing speedos. Women were a mix of swimwear including a very few who were either not aware that topless sunbathing for women was not permitted or didn't care.

Sounds awesome. Where did your cruise leave port from?