The perception of aesthetics in art and culture is always highly subjective and depends heavily on individual preferences, cultural context, and personal experience. There is no single, universal reason why everyone considers images of women with penises (often referred to as femboy or traps in some online communities, although these terms can be controversial and refer to various groups, including trans women, intersex people, or simply characters in art) to be more aesthetically pleasing.

However, several key factors can contribute to this perception in some people:

1. Violation of Expectations and Contrast

An image can be aesthetically appealing due to the contrast and surprise it creates. The combination of traditionally feminine traits (softness, a certain body type, makeup, clothing) with a phallic symbol (the penis), traditionally associated with masculinity and strength, creates powerful visual dissonance and androgyny. For some viewers, this disruption of binary gender norms is aesthetically appealing or provocative in itself.

2. Liberation from Gender Norms and the Expanding of Beauty

For some, this aesthetic is a symbol of gender freedom and transgression. It challenges traditional, narrow definitions of what is "beautiful" or "feminine," and allows for beauty to be seen in a variety of body shapes and gender expressions. This can be perceived as a more modern or progressive view of beauty.

In some subcultures and fandoms, this image can be fetishized. The novelty and rarity of such an image in mainstream culture can make it more exciting or intriguing, which often confuses aesthetic pleasure.

4. Popularity in Media and Art

The popularity of such imagery in anime, manga, fan art, and some forms of erotic art (especially in Japanese culture, which features the concept of otonko-no-ko, or boys dressing as girls) can also influence how it is perceived by a wider audience, making it more familiar and, consequently, more aesthetically acceptable or fashionable in certain circles.

It's important to note:

Not everyone who depicts or views such imagery does so out of fetishism; for many, it is truly a matter of aesthetics, identity, or the expression of an artistic concept.

The terminology used to describe such imagery can vary greatly and intersect with themes of transgenderism, intersex people, or simply androgynous self-expression in art.

Ultimately, "aesthetic" is the result of cultural conditioning, personal interests, and a psychological response to the contrast, freedom, and novelty that this imagery offers.