Still, an image of a woman in bikini - where's the problem?
This is a fundamental rule of social interaction: what matters is not what you find offensive personally - what matters is the 'superset' of all things that members of the audience might be upset or even just uncomfortable about.
Since it's a superset there will probably always be things that you don't care about that deeply - but which others find impolite or offensive.
This concept is especially important on technical conferences where a large number of cultures and subcultures meet and often the only common social platform they share are the narrow technical topics.
If you are conscious of that then it's going to be a pleasant experience for everyone involved.
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