Inclusion marketing is the marketing strategy of including images of diverse people side-by-side. In the case of the LGBT community you might see an ad where a same-sex couple is featured right alongside a straight couple as if that is a completely normal situation (which it is).
This is the future of our society and this is the future of marketing. Good examples of inclusion marketing which you may have seen on TV include this ad for the Amazon Kindle:
Or this ad for Microsoft Outlook:
An example of how you can use inclusion marketing for print advertisement in a wedding magazine is below. This ad appeals to not only same-sex couples but also opposite sex couples and simply reflects the diversity of the clientele that this planner works with. In short, everyone is included.
This is a very successful marketing strategy for you to consider as you create ads, especially print ads and banner ads for your business. You can also take this approach on your website. Although same-sex couples really are looking for images of other same-sex couples, you don't necessarily have to have a gay section on your website unless you do that section very very well. Including images of straight and gay couples side-by-side is a perfectly respectful and successful approach in reaching all audiences.